diff --git a/include/polarssl/cipher.h b/include/polarssl/cipher.h
index e78f8d1..006b104 100644
--- a/include/polarssl/cipher.h
+++ b/include/polarssl/cipher.h
@@ -29,10 +29,8 @@
 
 #include <string.h>
 
-#if defined(_MSC_VER) && !defined(inline)
-#define inline _inline
-#else
-#if defined(__ARMCC_VERSION) && !defined(inline)
+#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
+    !defined(inline) && !defined(__cplusplus)
 #define inline __inline
 #endif /* __ARMCC_VERSION */
 #endif /*_MSC_VER */