1 files changed, 1 insertions, 1 deletions
diff --git a/awkgram.y b/awkgram.y
index 57d97098..c59547eb 100644
--- a/awkgram.y
+++ b/awkgram.y
@@ -2815,7 +2815,7 @@ check_bad_char(int c)
 	}
 
 	if (iscntrl(c) && ! isspace(c))
-		fatal(_("PEBKAC error: invalid character '\\%03o' in source code"), c);
+		fatal(_("PEBKAC error: invalid character '\\%03o' in source code"), c & 0xFF);
 }
 
 /* nextc --- get the next input character */