1 files changed, 1 insertions, 0 deletions
diff --git a/diff.c b/diff.c
index 10d54405d2..5923fe281b 100644
--- a/diff.c
+++ b/diff.c
@@ -1628,6 +1628,7 @@ static void builtin_checkdiff(const char *name_a, const char *name_b,
 		xdemitcb_t ecb;
 
 		memset(&xecfg, 0, sizeof(xecfg));
+		xecfg.ctxlen = 1; /* at least one context line */
 		xpp.flags = XDF_NEED_MINIMAL;
 		xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
 			      &xpp, &xecfg, &ecb);