diff --git a/sys/applemedia/vtenc.c b/sys/applemedia/vtenc.c
index 39e58102c9..5c0c6ca625 100644
--- a/sys/applemedia/vtenc.c
+++ b/sys/applemedia/vtenc.c
@@ -58,7 +58,7 @@ const CFStringRef kVTCompressionPropertyKey_Quality = CFSTR ("Quality");
 #endif
 
 #ifdef HAVE_VIDEOTOOLBOX_10_9_6
-extern int
+extern OSStatus
 VTCompressionSessionPrepareToEncodeFrames (VTCompressionSessionRef session)
     __attribute__ ((weak_import));
 #endif