diff --git a/apps/codecs/libwma/wmafixed.h b/apps/codecs/libwma/wmafixed.h
index 0a6e8f61e0..8db1014a52 100644
--- a/apps/codecs/libwma/wmafixed.h
+++ b/apps/codecs/libwma/wmafixed.h
@@ -96,6 +96,8 @@ static inline int32_t fixmul32(int32_t x, int32_t y)
     );
     return x;
 }
+
+fixed32 fixmul32b(fixed32 x, fixed32 y);
 #else
 
 fixed32 fixmul32(fixed32 x, fixed32 y);