diff --git a/src/db.c b/src/db.c
index b4190f86..2219194b 100644
--- a/src/db.c
+++ b/src/db.c
@@ -480,8 +480,7 @@ void existsCommand(client *c) {
     int j;
 
     for (j = 1; j < c->argc; j++) {
-        expireIfNeeded(c->db,c->argv[j]);
-        if (dbExists(c->db,c->argv[j])) count++;
+        if (lookupKeyRead(c->db,c->argv[j])) count++;
     }
     addReplyLongLong(c,count);
 }
diff --git a/src/geohash.c b/src/geohash.c
index 1ae7a7e0..b40282e7 100644
--- a/src/geohash.c
+++ b/src/geohash.c
@@ -144,8 +144,8 @@ int geohashEncode(const GeoHashRange *long_range, const GeoHashRange *lat_range,
         (longitude - long_range->min) / (long_range->max - long_range->min);
 
     /* convert to fixed point based on the step size */
-    lat_offset *= (1 << step);
-    long_offset *= (1 << step);
+    lat_offset *= (1ULL << step);
+    long_offset *= (1ULL << step);
     hash->bits = interleave64(lat_offset, long_offset);
     return 1;
 }
diff --git a/src/networking.c b/src/networking.c
index 00558974..02e77307 100644
--- a/src/networking.c
+++ b/src/networking.c
@@ -247,7 +247,7 @@ void _addReplyStringToList(client *c, const char *s, size_t len) {
 
         /* Append to this object when possible. If tail == NULL it was
          * set via addDeferredMultiBulkLength(). */
-        if (tail && sdslen(tail)+len <= PROTO_REPLY_CHUNK_BYTES) {
+        if (tail && (sdsavail(tail) >= len || sdslen(tail)+len <= PROTO_REPLY_CHUNK_BYTES)) {
             tail = sdscatlen(tail,s,len);
             listNodeValue(ln) = tail;
             c->reply_bytes += len;