diff --git a/spec/suites/core/UtilSpec.js b/spec/suites/core/UtilSpec.js
index 09f536df..2e28b319 100644
--- a/spec/suites/core/UtilSpec.js
+++ b/spec/suites/core/UtilSpec.js
@@ -61,6 +61,28 @@ describe('Util', function() {
 		});
 	});
 
+
+	describe('#getParamString', function() {
+		it('should create a valid query string for appending depending on url input', function() {
+			var a = {
+				url:"http://example.com/get",
+				obj:{bar: 7, baz: 3},
+				result:"?bar=7&baz=3"
+			}
+
+			expect(L.Util.getParamString(a.obj,a.url)).toEqual(a.result);
+			
+			var b = {	
+				url:"http://example.com/get?justone=qs",
+				obj:{bar: 7, baz: 3},
+				result:"&bar=7&baz=3"
+			}
+			
+			expect(L.Util.getParamString(b.obj,b.url)).toEqual(b.result);
+
+		});
+	});
+
 	// TODO cancel/requestAnimFrame?
 
 	// TODO limitExecByInterval
@@ -71,7 +93,5 @@ describe('Util', function() {
 
 	// TODO setOptions
 
-	// TODO getParamString
-
 	// TODO template
 });
\ No newline at end of file
diff --git a/src/core/Util.js b/src/core/Util.js
index 86875dbc..1dfb09ea 100644
--- a/src/core/Util.js
+++ b/src/core/Util.js
@@ -77,14 +77,20 @@ L.Util = {
 		return obj.options;
 	},
 
-	getParamString: function (obj) {
+	getParamString: function (obj, existing_url) {
 		var params = [];
 		for (var i in obj) {
 			if (obj.hasOwnProperty(i)) {
 				params.push(i + '=' + obj[i]);
 			}
 		}
-		return '?' + params.join('&');
+		if (existing_url.indexOf('?')===-1) {
+			return '?' + params.join('&');
+		}
+		else {
+			return '&' + params.join('&');
+		}
+		
 	},
 
 	template: function (str, data) {
diff --git a/src/layer/tile/TileLayer.WMS.js b/src/layer/tile/TileLayer.WMS.js
index a145537c..1daba748 100644
--- a/src/layer/tile/TileLayer.WMS.js
+++ b/src/layer/tile/TileLayer.WMS.js
@@ -64,7 +64,7 @@ L.TileLayer.WMS = L.TileLayer.extend({
 
 		    url = L.Util.template(this._url, {s: this._getSubdomain(tilePoint)});
 
-		return url + L.Util.getParamString(this.wmsParams) + "&bbox=" + bbox;
+		return url + L.Util.getParamString(this.wmsParams, url) + "&bbox=" + bbox;
 	},
 
 	setParams: function (params, noRedraw) {