diff --git a/src/backend/regex/engine.c b/src/backend/regex/engine.c
index 45b37a4b4af..96be85671a9 100644
--- a/src/backend/regex/engine.c
+++ b/src/backend/regex/engine.c
@@ -148,8 +148,8 @@ int eflags;
 	struct match mv;
 	register struct match *m = &mv;
 	register char *dp;
-	const register sopno gf = g->firststate+1;	/* +1 for OEND */
-	const register sopno gl = g->laststate;
+	register const sopno gf = g->firststate+1;	/* +1 for OEND */
+	register const sopno gl = g->laststate;
 	char *start;
 	char *stop;