diff --git a/usr.sbin/config/mkmakefile.c b/usr.sbin/config/mkmakefile.c
index c9c2fbcdd06f..1dea251f76df 100644
--- a/usr.sbin/config/mkmakefile.c
+++ b/usr.sbin/config/mkmakefile.c
@@ -62,7 +62,6 @@ static void do_rules(FILE *);
 static void do_xxfiles(char *, FILE *);
 static void do_objs(FILE *);
 static void do_before_depend(FILE *);
-static int opteq(const char *, const char *);
 static void read_files(void);
 static void sanitize_envline(char *result, const char *src);
 static bool preprocess(char *line, char *result);
@@ -565,7 +564,8 @@ read_file(char *fname)
 				goto nextparam;
 			}
 		SLIST_FOREACH(op, &opt, op_next)
-			if (op->op_value == 0 && opteq(op->op_name, wd)) {
+			if (op->op_value == 0 &&
+			    strcasecmp(op->op_name, wd) == 0) {
 				if (not)
 					match = 0;
 				goto nextparam;
@@ -628,23 +628,6 @@ read_files(void)
 	}
 }
 
-static int
-opteq(const char *cp, const char *dp)
-{
-	char c, d;
-
-	for (; ; cp++, dp++) {
-		if (*cp != *dp) {
-			c = isupper(*cp) ? tolower(*cp) : *cp;
-			d = isupper(*dp) ? tolower(*dp) : *dp;
-			if (c != d)
-				return (0);
-		}
-		if (*cp == 0)
-			return (1);
-	}
-}
-
 static void
 do_before_depend(FILE *fp)
 {