diff --git a/desmume/src/cocoa/openemu/OESoundInterface.mm b/desmume/src/cocoa/openemu/OESoundInterface.mm
index b44378b18..2a744fe86 100644
--- a/desmume/src/cocoa/openemu/OESoundInterface.mm
+++ b/desmume/src/cocoa/openemu/OESoundInterface.mm
@@ -18,6 +18,7 @@
 #import "OESoundInterface.h"
 
 #import "cocoa_globals.h"
+#include <pthread.h>
 
 
 OERingBuffer *openEmuSoundInterfaceBuffer = nil;