diff --git a/include/polarssl/compat-1.2.h b/include/polarssl/compat-1.2.h
index ce4566c..3e9c396 100644
--- a/include/polarssl/compat-1.2.h
+++ b/include/polarssl/compat-1.2.h
@@ -32,7 +32,14 @@
 // Comment out to disable prototype change warnings
 #define SHOW_PROTOTYPE_CHANGE_WARNINGS
 
-#if defined _MSC_VER
+#if defined(_MSC_VER) && !defined(inline)
+#define inline _inline
+#else
+#if defined(__ARMCC_VERSION) && !defined(inline)
+#define inline __inline
+#endif /* __ARMCC_VERSION */
+
+#if defined(_MSC_VER)
 // MSVC does not support #warning
 #undef SHOW_PROTOTYPE_CHANGE_WARNINGS
 #endif