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-rw-r--r--xdiff/xmerge.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/xdiff/xmerge.c b/xdiff/xmerge.c
index 6d6fc1bc5e..9e13b25abc 100644
--- a/xdiff/xmerge.c
+++ b/xdiff/xmerge.c
@@ -336,7 +336,7 @@ static int xdl_refine_conflicts(xdfenv_t *xe1, xdfenv_t *xe2, xdmerge_t *m,
static int line_contains_alnum(const char *ptr, long size)
{
while (size--)
- if (isalnum(*(ptr++)))
+ if (isalnum((unsigned char)*(ptr++)))
return 1;
return 0;
}