1 files changed, 1 insertions, 1 deletions

diff --git a/src/buffer.c b/src/buffer.c
index 426e830ff3b..c2159627eb5 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -2121,7 +2121,7 @@ struct sortstrlist
    it's more efficient to hold onto the memory instead of repeatedly
    allocating and freeing it.  */
 static struct sortstrlist overlay_heads, overlay_tails;
-static char *overlay_str_buf;
+static unsigned char *overlay_str_buf;
 
 /* Allocated length of overlay_str_buf.  */
 static int overlay_str_len;