diff --git a/crypto/CMakeLists.txt b/crypto/CMakeLists.txt
index b59b7a265..ad2cdd7f8 100644
--- a/crypto/CMakeLists.txt
+++ b/crypto/CMakeLists.txt
@@ -22,7 +22,7 @@ elseif(UNIX)
   endif()
   set(ASM_EXT S)
   enable_language(ASM)
-  set(CMAKE_ASM_FLAGS "-Wa,--noexecstack")
+  set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} -Wa,--noexecstack")
 else()
   if (CMAKE_CL_64)
     message("Using nasm")