1 files changed, 2 insertions, 0 deletions
diff --git a/src/mwindow.h b/src/mwindow.h
index 1a391b055..7519fc36d 100644
--- a/src/mwindow.h
+++ b/src/mwindow.h
@@ -13,6 +13,8 @@
 #include "map.h"
 #include "vector.h"
 
+extern git_mutex git__mwindow_mutex;
+
 typedef struct git_mwindow {
 	struct git_mwindow *next;
 	git_map window_map;