diff --git a/src/lj_str.c b/src/lj_str.c
index a6a9364a..014665b6 100644
--- a/src/lj_str.c
+++ b/src/lj_str.c
@@ -152,7 +152,7 @@ GCstr *lj_str_new(lua_State *L, const char *str, size_t lenx)
   if (LJ_LIKELY((((uintptr_t)str+len-1) & (LJ_PAGESIZE-1)) <= LJ_PAGESIZE-4)) {
     while (o != NULL) {
       GCstr *sx = gco2str(o);
-      if (sx->len == len && str_fastcmp(str, strdata(sx), len) == 0) {
+      if (sx->hash == h && sx->len == len && str_fastcmp(str, strdata(sx), len) == 0) {
 	/* Resurrect if dead. Can only happen with fixstring() (keywords). */
 	if (isdead(g, o)) flipwhite(o);
 	return sx;  /* Return existing string. */
@@ -162,7 +162,7 @@ GCstr *lj_str_new(lua_State *L, const char *str, size_t lenx)
   } else {  /* Slow path: end of string is too close to a page boundary. */
     while (o != NULL) {
       GCstr *sx = gco2str(o);
-      if (sx->len == len && memcmp(str, strdata(sx), len) == 0) {
+      if (sx->hash == h && sx->len == len && memcmp(str, strdata(sx), len) == 0) {
 	/* Resurrect if dead. Can only happen with fixstring() (keywords). */
 	if (isdead(g, o)) flipwhite(o);
 	return sx;  /* Return existing string. */