diff --git a/library/common.h b/library/common.h
index 839b7d119c..48c275627e 100644
--- a/library/common.h
+++ b/library/common.h
@@ -242,8 +242,12 @@ static inline void mbedtls_xor_no_simd(unsigned char *r,
 /* Define `asm` for compilers which don't define it. */
 /* *INDENT-OFF* */
 #ifndef asm
+#if defined(__IAR_SYSTEMS_ICC__)
+#define asm __asm
+#else
 #define asm __asm__
 #endif
+#endif
 /* *INDENT-ON* */
 
 /*