diff --git a/lib/services/address/index.js b/lib/services/address/index.js
index bdbfe342..0a3c3555 100644
--- a/lib/services/address/index.js
+++ b/lib/services/address/index.js
@@ -285,7 +285,7 @@ AddressService.prototype._updateAddressIndex = function(key, add) {
       this.mempoolAddressIndex[key] = 1;
     }
   } else {
-    if (currentValue < 1) {
+    if (currentValue <= 1) {
       delete this.mempoolAddressIndex[key];
     } else {
       this.mempoolAddressIndex[key]--;
diff --git a/test/services/address/index.unit.js b/test/services/address/index.unit.js
index 8e8527f4..ce971636 100644
--- a/test/services/address/index.unit.js
+++ b/test/services/address/index.unit.js
@@ -2470,6 +2470,9 @@ describe('Address Service', function() {
       as._updateAddressIndex('index2', true);
       as._updateAddressIndex('index2', false);
       as._updateAddressIndex('index2', false);
+      as.mempoolAddressIndex.should.deep.equal({
+        "index1": 3
+      });
       as._updateAddressIndex('index2', false);
       as.mempoolAddressIndex.should.deep.equal({
         "index1": 3