diff --git a/src/debug.c b/src/debug.c
index bceae8b3..e0052657 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -409,12 +409,14 @@ void debugCommand(client *c) {
             addReplyError(c,"Not an sds encoded string.");
         } else {
             addReplyStatusFormat(c,
-                "key_sds_len:%lld, key_sds_avail:%lld, "
-                "val_sds_len:%lld, val_sds_avail:%lld",
+                "key_sds_len:%lld, key_sds_avail:%lld, key_zmalloc: %lld, "
+                "val_sds_len:%lld, val_sds_avail:%lld, val_zmalloc: %lld",
                 (long long) sdslen(key),
                 (long long) sdsavail(key),
+                (long long) sdsZmallocSize(key),
                 (long long) sdslen(val->ptr),
-                (long long) sdsavail(val->ptr));
+                (long long) sdsavail(val->ptr),
+                (long long) getStringObjectSdsUsedMemory(val));
         }
     } else if (!strcasecmp(c->argv[1]->ptr,"populate") &&
                (c->argc == 3 || c->argc == 4)) {
diff --git a/src/server.h b/src/server.h
index 3f2028f8..6d5edb5a 100644
--- a/src/server.h
+++ b/src/server.h
@@ -1242,6 +1242,8 @@ void addReplyHumanLongDouble(client *c, long double d);
 void addReplyLongLong(client *c, long long ll);
 void addReplyMultiBulkLen(client *c, long length);
 void copyClientOutputBuffer(client *dst, client *src);
+size_t sdsZmallocSize(sds s);
+size_t getStringObjectSdsUsedMemory(robj *o);
 void *dupClientReplyValue(void *o);
 void getClientsMaxBuffers(unsigned long *longest_output_list,
                           unsigned long *biggest_input_buffer);