diff --git a/src/hyperloglog.c b/src/hyperloglog.c
index 0ae66a0fc68a51621cd8ecac1b27f1f8f4e3b7d3..aba74803ae82d00da5dd4aedd27857e45b6c2bb7 100644
--- a/src/hyperloglog.c
+++ b/src/hyperloglog.c
@@ -520,6 +520,7 @@ void pfcountCommand(redisClient *c) {
         addReply(c,shared.czero);
     } else {
         if (isHLLObjectOrReply(c,o) != REDIS_OK) return;
+        o = dbUnshareStringValue(c->db,c->argv[1],o);
 
         /* Check if the cached cardinality is valid. */
         registers = o->ptr;
@@ -535,9 +536,6 @@ void pfcountCommand(redisClient *c) {
             card |= (uint64_t)registers[REDIS_HLL_SIZE-9] << 56;
         } else {
             /* Recompute it and update the cached value. */
-            o = dbUnshareStringValue(c->db,c->argv[1],o);
-            registers = o->ptr;
-
             card = hllCount(registers);
             registers[REDIS_HLL_SIZE-16] = card & 0xff;
             registers[REDIS_HLL_SIZE-15] = (card >> 8) & 0xff;