diff --git a/plugins/dynamics_processor/dynamics_processor.cpp b/plugins/dynamics_processor/dynamics_processor.cpp
index e5bea78d8..c9bd7317e 100644
--- a/plugins/dynamics_processor/dynamics_processor.cpp
+++ b/plugins/dynamics_processor/dynamics_processor.cpp
@@ -28,7 +28,7 @@
 #include <math.h>
 #include "embed.cpp"
 
-#ifdef LMMS_BUILD_WIN32
+#if defined (LMMS_BUILD_WIN32) || defined (LMMS_BUILD_APPLE) 
 #ifndef isnanf
 #define isnanf(x)	isnan(x)
 #endif