diff --git a/bytecheck/build.rs b/bytecheck/build.rs
index 9dd3c51..a421401 100644
--- a/bytecheck/build.rs
+++ b/bytecheck/build.rs
@@ -22,7 +22,7 @@ fn main() {
         // 64-bit atomics. (`armv7`, `armv7a`, and `armv7s`, specifically)
         "armv5te" | "mips" | "mipsel" | "powerpc" | "riscv32imac" | "thumbv7em" | "thumbv7m"
         | "thumbv8m.base" | "thumbv8m.main" | "armebv7r" | "armv7r" => has_atomic64 = false,
-        "avr" | "riscv32i" | "riscv32imc" | "thumbv6m" => {
+        "avr" | "riscv32i" | "riscv32im" | "riscv32imc" | "thumbv6m" => {
             has_atomic32 = false;
             has_atomic64 = false;
         }