diff --git a/Tools/Utils/getopt.c b/Tools/Utils/getopt.c
index 182062c4ab77e20d63507ceb54fbb885d351a69f..ea29020de330ad33958cde1ada18aeb22b16905e 100644
--- a/Tools/Utils/getopt.c
+++ b/Tools/Utils/getopt.c
@@ -74,7 +74,7 @@ getopt(int nargc, char * const *nargv, const char *ostr)
 		}
 	}					/* option letter okay? */
 	if ((optopt = (int)*place++) == (int)':' ||
-	    !(oli = strchr(ostr, optopt))) {
+	    !(oli = (char *)strchr(ostr, optopt))) {
 		/*
 		 * if the user didn't specify '-' as an option,
 		 * assume it means -1.