diff --git a/tests/karma.config.js b/tests/karma.config.js
index ed9836ed4c3bdbd7831342c0f01cca60bacea071..338e3f868e98b744de299b94ddabd1731caa694b 100644
--- a/tests/karma.config.js
+++ b/tests/karma.config.js
@@ -121,6 +121,9 @@ module.exports = function(config) {
 		files.push('apps/' + appsToTest[i] + '/tests/js/*.js');
 	}
 
+	// serve images to avoid warnings
+	files.push({pattern: 'core/img/**/*', watched: false, included: false, served: true});
+
 	config.set({
 
 		// base path, that will be used to resolve files and exclude
@@ -137,6 +140,11 @@ module.exports = function(config) {
 
 		],
 
+		proxies: {
+			// prevent warnings for images
+			'/context.html//core/img/': 'http://localhost:9876/base/core/img/'
+		},
+
 		// test results reporter to use
 		// possible values: 'dots', 'progress', 'junit', 'growl', 'coverage'
 		reporters: ['dots', 'junit', 'coverage'],