diff --git a/src/hyperloglog.c b/src/hyperloglog.c
index 3fbca201dec..caec2ff0ee8 100644
--- a/src/hyperloglog.c
+++ b/src/hyperloglog.c
@@ -435,8 +435,8 @@ uint64_t hllCount(uint8_t *registers) {
 
 /* ========================== HyperLogLog commands ========================== */
 
-/* PADD var ele ele ele ... ele => :0 or :1 */
-void paddCommand(redisClient *c) {
+/* PFADD var ele ele ele ... ele => :0 or :1 */
+void pfaddCommand(redisClient *c) {
     robj *o = lookupKeyWrite(c->db,c->argv[1]);
     uint8_t *registers;
     int updated = 0, j;
@@ -482,8 +482,8 @@ void paddCommand(redisClient *c) {
     addReply(c, updated ? shared.cone : shared.czero);
 }
 
-/* PCOUNT var -> approximated cardinality of set. */
-void pcountCommand(redisClient *c) {
+/* PFCOUNT var -> approximated cardinality of set. */
+void pfcountCommand(redisClient *c) {
     robj *o = lookupKeyRead(c->db,c->argv[1]);
     uint8_t *registers;
     uint64_t card;
@@ -540,8 +540,8 @@ void pcountCommand(redisClient *c) {
     }
 }
 
-/* PMERGE dest src1 src2 src3 ... srcN => OK */
-void pmergeCommand(redisClient *c) {
+/* PFMERGE dest src1 src2 src3 ... srcN => OK */
+void pfmergeCommand(redisClient *c) {
     uint8_t max[REDIS_HLL_REGISTERS];
     uint8_t *registers;
     int j, i;
@@ -614,7 +614,7 @@ void pmergeCommand(redisClient *c) {
  * the correct value to be retained and not affect adjacent values. */
 
 #define REDIS_HLL_TEST_CYCLES 1000
-void pselftestCommand(redisClient *c) {
+void pfselftestCommand(redisClient *c) {
     int j, i;
     sds bitcounters = sdsnewlen(NULL,REDIS_HLL_SIZE);
     uint8_t bytecounters[REDIS_HLL_REGISTERS];
diff --git a/src/redis.c b/src/redis.c
index dbcf561fe0b..03268be7971 100644
--- a/src/redis.c
+++ b/src/redis.c
@@ -268,10 +268,10 @@ struct redisCommand redisCommandTable[] = {
     {"bitcount",bitcountCommand,-2,"r",0,NULL,1,1,1,0,0},
     {"bitpos",bitposCommand,-3,"r",0,NULL,1,1,1,0,0},
     {"wait",waitCommand,3,"rs",0,NULL,0,0,0,0,0},
-    {"pselftest",pselftestCommand,1,"r",0,NULL,0,0,0,0,0},
-    {"padd",paddCommand,-2,"wm",0,NULL,1,1,1,0,0},
-    {"pcount",pcountCommand,2,"w",0,NULL,1,1,1,0,0},
-    {"pmerge",pmergeCommand,-2,"wm",0,NULL,1,-1,1,0,0}
+    {"pfselftest",pfselftestCommand,1,"r",0,NULL,0,0,0,0,0},
+    {"pfadd",pfaddCommand,-2,"wm",0,NULL,1,1,1,0,0},
+    {"pfcount",pfcountCommand,2,"w",0,NULL,1,1,1,0,0},
+    {"pfmerge",pfmergeCommand,-2,"wm",0,NULL,1,-1,1,0,0}
 };
 
 struct evictionPoolEntry *evictionPoolAlloc(void);
diff --git a/src/redis.h b/src/redis.h
index b7857dfa897..35345d3882a 100644
--- a/src/redis.h
+++ b/src/redis.h
@@ -1448,10 +1448,10 @@ void bitcountCommand(redisClient *c);
 void bitposCommand(redisClient *c);
 void replconfCommand(redisClient *c);
 void waitCommand(redisClient *c);
-void pselftestCommand(redisClient *c);
-void paddCommand(redisClient *c);
-void pcountCommand(redisClient *c);
-void pmergeCommand(redisClient *c);
+void pfselftestCommand(redisClient *c);
+void pfaddCommand(redisClient *c);
+void pfcountCommand(redisClient *c);
+void pfmergeCommand(redisClient *c);
 
 #if defined(__GNUC__)
 void *calloc(size_t count, size_t size) __attribute__ ((deprecated));
diff --git a/utils/hyperloglog/hll-err.rb b/utils/hyperloglog/hll-err.rb
index 8481844bc03..75bb8e4246f 100644
--- a/utils/hyperloglog/hll-err.rb
+++ b/utils/hyperloglog/hll-err.rb
@@ -18,9 +18,9 @@
             elements << ele
             i += 1
         }
-        r.padd('hll',*elements)
+        r.pfadd('hll',*elements)
     }
-    approx = r.pcount('hll')
+    approx = r.pfcount('hll')
     abs_err = (approx-i).abs
     rel_err = 100.to_f*abs_err/i
     puts "#{i} vs #{approx}: #{rel_err}%"
diff --git a/utils/hyperloglog/hll-gnuplot-graph.rb b/utils/hyperloglog/hll-gnuplot-graph.rb
index 41e7f717ab4..6d80adf05d8 100644
--- a/utils/hyperloglog/hll-gnuplot-graph.rb
+++ b/utils/hyperloglog/hll-gnuplot-graph.rb
@@ -30,9 +30,9 @@ def run_experiment(r,seed,max,step)
                 elements << ele
                 i += 1
             }
-            r.padd('hll',*elements)
+            r.pfadd('hll',*elements)
         }
-        approx = r.pcount('hll')
+        approx = r.pfcount('hll')
         err = approx-i
         rel_err = 100.to_f*err/i
         samples << [i,rel_err]