diff --git a/lib/sqlite3.js b/lib/sqlite3.js
index fe56159..1743e8a 100644
--- a/lib/sqlite3.js
+++ b/lib/sqlite3.js
@@ -286,7 +286,9 @@ SQLite3.prototype.disconnect = function disconnect(cb) {
 };
 
 SQLite3.prototype.getInsertedId = function(model, info) {
-  return info.lastID;
+  if (this._isPrimaryKeyInteger(model)) {
+    return info.lastID;
+  }
 };
 
 /**
@@ -366,6 +368,18 @@ SQLite3.prototype._buildColumnDefinition = function(model, propertyName) {
   return line;
 };
 
+SQLite3.prototype._isPrimaryKeyInteger = function(model) {
+  var properties = this.getModelDefinition(model).properties;
+  for (var propertyName in properties) {
+    if (!properties.hasOwnProperty(propertyName)) continue;
+    var property = this.getModelDefinition(model).properties[propertyName];
+    if (property.id) {
+      return this._columnDataType(model, propertyName) === 'INTEGER';
+    }
+  }
+  return false;
+};
+
 function _convertBoolean(value) {
   var booleanTrue = ['t', 'T', 'y', 'Y', '1', 1, true];
   var booleanFalse = ['f', 'F', 'n', 'N', '0', 0, false];
diff --git a/test/sqlite.test.js b/test/sqlite.test.js
index d470282..5fc43f2 100644
--- a/test/sqlite.test.js
+++ b/test/sqlite.test.js
@@ -10,6 +10,7 @@ require('./init');
 var should = require('should');
 
 var Post;
+var ModelWithPKString;
 var db;
 
 /*global describe, before, it, getDataSource*/
@@ -24,11 +25,16 @@ describe('sqlite3 connector', function() {
       loc: 'GeoPoint',
       approved: Boolean
     });
+
+    ModelWithPKString = db.define('ModelWithPKString', {
+      id: {type: String, id: true},
+      content: {type: String},
+    });
   });
 
   it('should run migration', function(done) {
-    db.automigrate('PostWithBoolean', function() {
-      done();
+    db.automigrate(['PostWithBoolean', 'ModelWithPKString'], function(err) {
+      done(err);
     });
   });
 
@@ -139,6 +145,27 @@ describe('sqlite3 connector', function() {
         done();
       });
     });
+
+  it('should return the id inserted when primary key is a string type',
+    function(done) {
+      ModelWithPKString.create({id: 'PK_ID_TEST', content: 'content_TEST'},
+        function(err, p) {
+          should.not.exists(err);
+          p.should.have.property('id', 'PK_ID_TEST');
+          p.should.have.property('content', 'content_TEST');
+          done();
+        });
+    });
+
+  it('should return 0 documents when filtering with non existing field',
+    function(done) {
+      Post.count({nonexistingfield: '__TEST__'},
+        function(err, count) {
+          should.not.exists(err);
+          count.should.equal(0);
+          done();
+        });
+    });
 });
 
 // FIXME: The following test cases are to be reactivated for PostgreSQL