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-rw-r--r--usr.bin/m4/extern.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/usr.bin/m4/extern.h b/usr.bin/m4/extern.h
index 57a0600b1348..30d3b95334c4 100644
--- a/usr.bin/m4/extern.h
+++ b/usr.bin/m4/extern.h
@@ -163,7 +163,7 @@ static __inline int gpbc(void)
if (bp > bufbase) {
if (*--bp)
- return (*bp);
+ return ((unsigned char)*bp);
else
return (EOF);
}