diff --git a/CMakeLists.txt b/CMakeLists.txt
index b901704d34..61b026ead0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -118,7 +118,7 @@ elseif(CMAKE_C_COMPILER_ID MATCHES "GNU")
   set(GCC 1)
 endif()
 
-if (UNIX AND NOT APPLE)
+if (NOT WIN32 AND NOT APPLE)
   include(GNUInstallDirs)
 elseif(NOT DEFINED CMAKE_INSTALL_LIBDIR)
   set(CMAKE_INSTALL_LIBDIR "lib")
@@ -737,7 +737,7 @@ if(FIPS)
     message(FATAL_ERROR "Building AWS-LC for FIPS requires Go and Perl")
   endif()
 
-  if(NOT BUILD_SHARED_LIBS AND NOT (UNIX AND NOT APPLE))
+  if(NOT BUILD_SHARED_LIBS AND NOT (NOT WIN32 AND NOT APPLE))
     message(FATAL_ERROR "Static FIPS build of AWS-LC is suported only on Linux")
   endif()
 
diff --git a/crypto/CMakeLists.txt b/crypto/CMakeLists.txt
index a503186815..adf7c805c5 100644
--- a/crypto/CMakeLists.txt
+++ b/crypto/CMakeLists.txt
@@ -44,7 +44,7 @@ function(msbuild_aarch64_asm)
 endfunction()
 
 if(NOT OPENSSL_NO_ASM)
-  if(UNIX)
+  if(NOT WIN32)
     if(ARCH STREQUAL "aarch64")
       # The "armx" Perl scripts look for "64" in the style argument
       # in order to decide whether to generate 32- or 64-bit asm.
@@ -186,7 +186,7 @@ else()
     set(ASSEMBLY_SOURCE ${GENERATE_CODE_ROOT}/ios-arm/crypto/)
   elseif(APPLE)
     set(ASSEMBLY_SOURCE ${GENERATE_CODE_ROOT}/mac-${ARCH}/crypto/)
-  elseif(UNIX)
+  elseif(NOT WIN32)
     if(${ARCH} STREQUAL "generic")
       message(STATUS "Detected generic linux platform. No assembly files will be included.")
     else()