diff --git a/include/mbedtls/md.h b/include/mbedtls/md.h
index 1834b59..a70d7a6 100644
--- a/include/mbedtls/md.h
+++ b/include/mbedtls/md.h
@@ -27,7 +27,8 @@
 
 #include <stddef.h>
 
-#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && !defined(inline)
+#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
+    !defined(inline) && !defined(__cplusplus)
 #define inline __inline
 #endif