diff --git a/wolfcrypt/src/misc.c b/wolfcrypt/src/misc.c
index 99dc2abeb..0dad30033 100644
--- a/wolfcrypt/src/misc.c
+++ b/wolfcrypt/src/misc.c
@@ -89,6 +89,8 @@ STATIC INLINE word32 ByteReverseWord32(word32 value)
 #ifdef PPC_INTRINSICS
     /* PPC: load reverse indexed instruction */
     return (word32)__lwbrx(&value,0);
+#elif defined(__ICCARM__)
+    return (word32)__REV(value);
 #elif defined(KEIL_INTRINSICS)
     return (word32)__rev(value);
 #elif defined(FAST_ROTATE)
diff --git a/wolfssl/wolfcrypt/settings.h b/wolfssl/wolfcrypt/settings.h
index c463711b0..e65f0617b 100644
--- a/wolfssl/wolfcrypt/settings.h
+++ b/wolfssl/wolfcrypt/settings.h
@@ -938,7 +938,7 @@ static char *fgets(char *buff, int sz, FILE *fp)
     #define NO_RABBIT
     #define STM32F2_RNG
     #define STM32F2_CRYPTO
-    #ifndef __GNUC__
+    #if !defined(__GNUC__) && !defined(__ICCARM__)
         #define KEIL_INTRINSICS
     #endif
     #define NO_OLD_RNGNAME
@@ -963,7 +963,7 @@ static char *fgets(char *buff, int sz, FILE *fp)
     #define STM32F4_RNG
     #define STM32F4_CRYPTO
     #define NO_OLD_RNGNAME
-    #ifndef __GNUC__
+    #if !defined(__GNUC__) && !defined(__ICCARM__)
         #define KEIL_INTRINSICS
     #endif
     #ifdef WOLFSSL_STM32_CUBEMX