diff --git a/library/threading.c b/library/threading.c
index c1834ba..9d5c4f1 100644
--- a/library/threading.c
+++ b/library/threading.c
@@ -37,7 +37,7 @@
 
 #include "mbedtls/threading.h"
 
-#if !defined(_WIN32) && !defined(__IAR_SYSTEMS_ICC__) && (defined(unix) || \
+#if !defined(_WIN32) && (defined(unix) || \
     defined(__unix) || defined(__unix__) || (defined(__APPLE__) && \
     defined(__MACH__)))
 #include <unistd.h>
@@ -51,7 +51,7 @@
  */
 #define THREADING_USE_GMTIME
 #endif /* !_POSIX_VERSION || 200112L > _POSIX_THREAD_SAFE_FUNCTIONS */
-#endif /* !_WIN32 && !__IAR_SYSTEMS_ICC__ && (unix || __unix || __unix__ ||
+#endif /* !_WIN32 && (unix || __unix || __unix__ ||
         * (__APPLE__ && __MACH__)) */
 
 #if defined(MBEDTLS_THREADING_PTHREAD)