diff --git a/src/evict.c b/src/evict.c
index 5ce5ca07..0a04ed1b 100644
--- a/src/evict.c
+++ b/src/evict.c
@@ -334,7 +334,7 @@ uint8_t LFULogIncr(uint8_t counter) {
 unsigned long LFUDecrAndReturn(robj *o) {
     unsigned long ldt = o->lru >> 8;
     unsigned long counter = o->lru & 255;
-    if (LFUTimeElapsed(ldt) >= server.lfu_decay_time && counter) {
+    if (LFUTimeElapsed(ldt) >= (unsigned long)server.lfu_decay_time && counter) {
         if (counter > LFU_INIT_VAL*2) {
             counter /= 2;
             if (counter < LFU_INIT_VAL*2) counter = LFU_INIT_VAL*2;
diff --git a/src/server.h b/src/server.h
index e3b56075..aa04344c 100644
--- a/src/server.h
+++ b/src/server.h
@@ -1118,8 +1118,8 @@ struct redisServer {
     unsigned long long maxmemory;   /* Max number of memory bytes to use */
     int maxmemory_policy;           /* Policy for key eviction */
     int maxmemory_samples;          /* Pricision of random sampling */
-    unsigned int lfu_log_factor;    /* LFU logarithmic counter factor. */
-    unsigned int lfu_decay_time;    /* LFU counter decay factor. */
+    int lfu_log_factor;             /* LFU logarithmic counter factor. */
+    int lfu_decay_time;             /* LFU counter decay factor. */
     /* Blocked clients */
     unsigned int bpop_blocked_clients; /* Number of clients blocked by lists */
     list *unblocked_clients; /* list of clients to unblock before next loop */