diff --git GitUpKit/Third-Party/libgit2/src/diff_generate.c GitUpKit/Third-Party/libgit2/src/diff_generate.c
index 568fb9743..776f443ef 100644
--- GitUpKit/Third-Party/libgit2/src/diff_generate.c
+++ GitUpKit/Third-Party/libgit2/src/diff_generate.c
@@ -24,7 +24,7 @@
 	(((DIFF)->base.opts.flags & (FLAG)) == 0)
 #define DIFF_FLAG_SET(DIFF,FLAG,VAL) (DIFF)->base.opts.flags = \
 	(VAL) ? ((DIFF)->base.opts.flags | (FLAG)) : \
-	((DIFF)->base.opts.flags & ~(VAL))
+	((DIFF)->base.opts.flags & ~(FLAG))
 
 typedef struct {
 	struct git_diff base;
