diff --git a/src/sc_man_scanner.re b/src/sc_man_scanner.re
index 66058ac8c..dd90ce1d1 100644
--- a/src/sc_man_scanner.re
+++ b/src/sc_man_scanner.re
@@ -1,4 +1,4 @@
-#define	YYCTYPE		char
+#define	YYCTYPE		unsigned char
 #define	YYCURSOR	cursor
 #define	YYLIMIT		limit
 #define	YYMARKER	marker