diff --git a/secure_fw/spm/include/utilities.h b/secure_fw/spm/include/utilities.h
index f527071..aec3ea0 100644
--- a/secure_fw/spm/include/utilities.h
+++ b/secure_fw/spm/include/utilities.h
@@ -37,4 +37,8 @@
 /* FixMe: Replace ERROR_MSG() in platform code with a suitable API */
 #define ERROR_MSG(msg) SPMLOG_ERRMSG(msg "\r\n")
 
+/* Preprocessor to reference C MACRO to string in inline asm */
+#define M2S_HELPER(x)  #x
+#define M2S(m)         M2S_HELPER(m)
+
 #endif /* __TFM_UTILS_H__ */