diff --git a/fuzzers/forkserver_libafl_cc/src/lib.rs b/fuzzers/forkserver_libafl_cc/src/lib.rs
index 2a56df02cd..2646c42bf2 100644
--- a/fuzzers/forkserver_libafl_cc/src/lib.rs
+++ b/fuzzers/forkserver_libafl_cc/src/lib.rs
@@ -1,7 +1,7 @@
 use libafl_targets::{map_shared_memory, start_forkserver};
 
 #[no_mangle]
-pub fn libafl_start_forkserver() {
+pub extern "C" fn libafl_start_forkserver() {
     // Map shared memory region for the edge coverage map
     map_shared_memory();
     // Start the forkserver
diff --git a/fuzzers/fuzzbench/src/lib.rs b/fuzzers/fuzzbench/src/lib.rs
index eef5e6f119..0542c75789 100644
--- a/fuzzers/fuzzbench/src/lib.rs
+++ b/fuzzers/fuzzbench/src/lib.rs
@@ -57,7 +57,7 @@ use nix::{self, unistd::dup};
 
 /// The fuzzer main (as `no_mangle` C function)
 #[no_mangle]
-pub fn libafl_main() {
+pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
     //RegistryBuilder::register::<Tokens>();
diff --git a/fuzzers/fuzzbench_text/src/lib.rs b/fuzzers/fuzzbench_text/src/lib.rs
index b59cf7c4e6..74004cefc6 100644
--- a/fuzzers/fuzzbench_text/src/lib.rs
+++ b/fuzzers/fuzzbench_text/src/lib.rs
@@ -64,7 +64,7 @@ use nix::{self, unistd::dup};
 /// The fuzzer main (as `no_mangle` C function)
 #[no_mangle]
 #[allow(clippy::too_many_lines)]
-pub fn libafl_main() {
+pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
     //RegistryBuilder::register::<Tokens>();
diff --git a/fuzzers/libafl_atheris/src/lib.rs b/fuzzers/libafl_atheris/src/lib.rs
index 8d99f52ac3..98bac10a0f 100644
--- a/fuzzers/libafl_atheris/src/lib.rs
+++ b/fuzzers/libafl_atheris/src/lib.rs
@@ -48,7 +48,7 @@ use libafl_targets::{
 
 /// Set up our coverage map.
 #[no_mangle]
-pub fn __sanitizer_cov_8bit_counters_init(start: *mut u8, stop: *mut u8) {
+pub extern "C" fn __sanitizer_cov_8bit_counters_init(start: *mut u8, stop: *mut u8) {
     unsafe {
         EDGES_MAP_PTR = start;
         MAX_EDGES_NUM = (stop as usize - start as usize) / 8;
@@ -58,7 +58,7 @@ pub fn __sanitizer_cov_8bit_counters_init(start: *mut u8, stop: *mut u8) {
 /// `pcs` tables seem to be unused by `Atheris`, so we can ignore this setup function,
 /// but the symbol is still being called and, hence, required.
 #[no_mangle]
-pub fn __sanitizer_cov_pcs_init(_pcs_beg: *mut u8, _pcs_end: *mut u8) {
+pub extern "C" fn __sanitizer_cov_pcs_init(_pcs_beg: *mut u8, _pcs_end: *mut u8) {
     // noop
 }
 
@@ -66,7 +66,7 @@ pub fn __sanitizer_cov_pcs_init(_pcs_beg: *mut u8, _pcs_end: *mut u8) {
 /// This is a PoC implementation and could be improved.
 /// For example, it only takes up to 8 bytes into consideration.
 #[no_mangle]
-pub fn __sanitizer_weak_hook_memcmp(
+pub extern "C" fn __sanitizer_weak_hook_memcmp(
     _caller_pc: *const c_void,
     s1: *const c_void,
     s2: *const c_void,
@@ -104,7 +104,7 @@ pub fn __sanitizer_weak_hook_memcmp(
 /// and jumps back into `Atheris'` instrumented python code.
 #[no_mangle]
 #[allow(non_snake_case)]
-pub fn LLVMFuzzerRunDriver(
+pub extern "C" fn LLVMFuzzerRunDriver(
     _argc: *const c_int,
     _argv: *const *const c_char,
     harness_fn: Option<extern "C" fn(*const u8, usize) -> c_int>,
diff --git a/fuzzers/libfuzzer_libmozjpeg/src/lib.rs b/fuzzers/libfuzzer_libmozjpeg/src/lib.rs
index 034194c204..95a91ce44c 100644
--- a/fuzzers/libfuzzer_libmozjpeg/src/lib.rs
+++ b/fuzzers/libfuzzer_libmozjpeg/src/lib.rs
@@ -42,7 +42,7 @@ extern "C" {
 
 /// The main fn, usually parsing parameters, and starting the fuzzer
 #[no_mangle]
-pub fn libafl_main() {
+pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
     //RegistryBuilder::register::<Tokens>();
diff --git a/fuzzers/libfuzzer_libpng/src/lib.rs b/fuzzers/libfuzzer_libpng/src/lib.rs
index 35b5fe5db5..fbf8f2a2ac 100644
--- a/fuzzers/libfuzzer_libpng/src/lib.rs
+++ b/fuzzers/libfuzzer_libpng/src/lib.rs
@@ -41,7 +41,7 @@ use libafl_targets::{libfuzzer_initialize, libfuzzer_test_one_input, EDGES_MAP,
 /// The main fn, `no_mangle` as it is a C main
 #[cfg(not(test))]
 #[no_mangle]
-pub fn libafl_main() {
+pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
     //RegistryBuilder::register::<Tokens>();
diff --git a/fuzzers/libfuzzer_libpng_accounting/src/lib.rs b/fuzzers/libfuzzer_libpng_accounting/src/lib.rs
index ce62e5ed7d..0f117f166f 100644
--- a/fuzzers/libfuzzer_libpng_accounting/src/lib.rs
+++ b/fuzzers/libfuzzer_libpng_accounting/src/lib.rs
@@ -113,7 +113,7 @@ struct Opt {
 
 /// The main fn, `no_mangle` as it is a C symbol
 #[no_mangle]
-pub fn libafl_main() {
+pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
     //RegistryBuilder::register::<Tokens>();
diff --git a/fuzzers/libfuzzer_libpng_centralized/src/lib.rs b/fuzzers/libfuzzer_libpng_centralized/src/lib.rs
index f5bb6c3b36..8dc3b770f9 100644
--- a/fuzzers/libfuzzer_libpng_centralized/src/lib.rs
+++ b/fuzzers/libfuzzer_libpng_centralized/src/lib.rs
@@ -112,7 +112,7 @@ struct Opt {
 
 /// The main fn, `no_mangle` as it is a C symbol
 #[no_mangle]
-pub fn libafl_main() {
+pub extern "C" fn libafl_main() {
     env_logger::init();
 
     // Registry the metadata types used in this fuzzer
diff --git a/fuzzers/libfuzzer_libpng_cmin/src/lib.rs b/fuzzers/libfuzzer_libpng_cmin/src/lib.rs
index 1fc59e6bf2..e177575338 100644
--- a/fuzzers/libfuzzer_libpng_cmin/src/lib.rs
+++ b/fuzzers/libfuzzer_libpng_cmin/src/lib.rs
@@ -44,7 +44,7 @@ use libafl_targets::{libfuzzer_initialize, libfuzzer_test_one_input, std_edges_m
 /// The main fn, `no_mangle` as it is a C main
 #[cfg(not(test))]
 #[no_mangle]
-pub fn libafl_main() {
+pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
     //RegistryBuilder::register::<Tokens>();
diff --git a/fuzzers/libfuzzer_libpng_ctx/src/lib.rs b/fuzzers/libfuzzer_libpng_ctx/src/lib.rs
index 9ae48549c8..d50f201db1 100644
--- a/fuzzers/libfuzzer_libpng_ctx/src/lib.rs
+++ b/fuzzers/libfuzzer_libpng_ctx/src/lib.rs
@@ -108,7 +108,7 @@ struct Opt {
 
 /// The main fn, `no_mangle` as it is a C symbol
 #[no_mangle]
-pub fn libafl_main() {
+pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
     //RegistryBuilder::register::<Tokens>();
diff --git a/fuzzers/libfuzzer_libpng_launcher/src/lib.rs b/fuzzers/libfuzzer_libpng_launcher/src/lib.rs
index ffef102464..1c0c657c81 100644
--- a/fuzzers/libfuzzer_libpng_launcher/src/lib.rs
+++ b/fuzzers/libfuzzer_libpng_launcher/src/lib.rs
@@ -111,7 +111,7 @@ struct Opt {
 
 /// The main fn, `no_mangle` as it is a C symbol
 #[no_mangle]
-pub fn libafl_main() {
+pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
     //RegistryBuilder::register::<Tokens>();
diff --git a/fuzzers/libfuzzer_libpng_norestart/src/lib.rs b/fuzzers/libfuzzer_libpng_norestart/src/lib.rs
index cabc4a5354..5c76afc983 100644
--- a/fuzzers/libfuzzer_libpng_norestart/src/lib.rs
+++ b/fuzzers/libfuzzer_libpng_norestart/src/lib.rs
@@ -129,7 +129,7 @@ struct Opt {
 
 /// The main fn, `no_mangle` as it is a C symbol
 #[no_mangle]
-pub fn libafl_main() {
+pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
     //RegistryBuilder::register::<Tokens>();
diff --git a/fuzzers/libfuzzer_reachability/src/lib.rs b/fuzzers/libfuzzer_reachability/src/lib.rs
index ad6d049605..96f7320202 100644
--- a/fuzzers/libfuzzer_reachability/src/lib.rs
+++ b/fuzzers/libfuzzer_reachability/src/lib.rs
@@ -32,7 +32,7 @@ extern "C" {
 
 /// The main fn, `no_mangle` as it is a C symbol
 #[no_mangle]
-pub fn libafl_main() {
+pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
     //RegistryBuilder::register::<Tokens>();
diff --git a/fuzzers/libfuzzer_windows_asan/src/lib.rs b/fuzzers/libfuzzer_windows_asan/src/lib.rs
index 0cb39415a7..e2fb967c41 100644
--- a/fuzzers/libfuzzer_windows_asan/src/lib.rs
+++ b/fuzzers/libfuzzer_windows_asan/src/lib.rs
@@ -27,7 +27,7 @@ use libafl::{
 };
 use libafl_targets::{libfuzzer_initialize, libfuzzer_test_one_input, std_edges_map_observer};
 #[no_mangle]
-pub fn libafl_main() {
+pub extern "C" fn libafl_main() {
     println!(
         "Workdir: {:?}",
         env::current_dir().unwrap().to_string_lossy().to_string()
diff --git a/fuzzers/nautilus_sync/src/lib.rs b/fuzzers/nautilus_sync/src/lib.rs
index e94302a65a..91d285b2bd 100644
--- a/fuzzers/nautilus_sync/src/lib.rs
+++ b/fuzzers/nautilus_sync/src/lib.rs
@@ -100,7 +100,7 @@ struct Opt {
 
 /// The main fn, `no_mangle` as it is a C symbol
 #[no_mangle]
-pub fn libafl_main() {
+pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
     //RegistryBuilder::register::<Tokens>();
diff --git a/fuzzers/tutorial/src/lib.rs b/fuzzers/tutorial/src/lib.rs
index 725b732890..d0ca10980e 100644
--- a/fuzzers/tutorial/src/lib.rs
+++ b/fuzzers/tutorial/src/lib.rs
@@ -36,7 +36,7 @@ use metadata::*;
 /// The main fn, `no_mangle` as it is a C main
 #[cfg(not(test))]
 #[no_mangle]
-pub fn libafl_main() {
+pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
     //RegistryBuilder::register::<Tokens>();