diff --git a/modules/codec/quicktime.c b/modules/codec/quicktime.c
index ac4c2d91c5..fb9fdff8cc 100644
--- a/modules/codec/quicktime.c
+++ b/modules/codec/quicktime.c
@@ -850,6 +850,8 @@ exit_error:
 #endif
     vlc_mutex_unlock( &qt_mutex );
 
+#else
+    VLC_UNUSED( p_dec );
 #endif /* !WIN32 */
 
     return VLC_EGENERIC;