diff --git a/corec/corec/portab.h b/corec/corec/portab.h
index a4825124..962e774a 100644
--- a/corec/corec/portab.h
+++ b/corec/corec/portab.h
@@ -311,6 +311,8 @@ typedef uint16_t utf16_t;
 
 #if defined(COMPILER_GCC)
 #define UNUSED_PARAM(x) (x) __attribute__ ((unused))
+#elif defined(_MSC_VER)
+#define UNUSED_PARAM(x) (x)  __pragma(warning(suppress:4100 4131)) (x)
 #else
 #define UNUSED_PARAM(x) (x)
 #endif