diff --git a/src/lib/src/functions.cpp b/src/lib/src/functions.cpp
index 4f6c62d76..72d19db64 100644
--- a/src/lib/src/functions.cpp
+++ b/src/lib/src/functions.cpp
@@ -464,7 +464,12 @@ QString getExtension(const QString &url)
 {
 	const int lastDot = url.lastIndexOf('.');
 	if (lastDot != -1) {
-		return url.mid(lastDot + 1);
+		const int doubleDot = url.midRef(lastDot + 1).indexOf(':');
+		if (doubleDot != -1) {
+			return url.mid(lastDot + 1, doubleDot);
+		} else {
+			return url.mid(lastDot + 1);
+		}
 	}
 	return QString();
 }
@@ -490,7 +495,8 @@ QUrl setExtension(QUrl url, const QString &extension)
 	const int lastSlash = path.lastIndexOf('/');
 	const int lastDot = path.midRef(lastSlash + 1).lastIndexOf('.');
 	if (lastDot != -1) {
-		url.setPath(path.left(lastDot + lastSlash + 1) + "." + extension);
+		const int doubleDot = path.midRef(lastDot + 1).indexOf(':');
+		url.setPath(path.left(lastDot + lastSlash + 1) + "." + extension + (doubleDot != -1 ? path.mid(lastDot + doubleDot + 1) : ""));
 	}
 
 	return url;
diff --git a/src/tests/src/functions-test.cpp b/src/tests/src/functions-test.cpp
index 26d840b1d..40e828514 100644
--- a/src/tests/src/functions-test.cpp
+++ b/src/tests/src/functions-test.cpp
@@ -192,7 +192,8 @@ TEST_CASE("Functions")
 		REQUIRE(getExtension(QUrl("http://test.com/some.dir/file")) == QString(""));
 		REQUIRE(getExtension(QUrl("http://test.com/file.jpg")) == QString("jpg"));
 		REQUIRE(getExtension(QUrl("http://test.com/file.jpg?toto=1")) == QString("jpg"));
-		REQUIRE(getExtension(QUrl("http://test.com/file.jpg?toto=1")) == QString("jpg"));
+		REQUIRE(getExtension(QUrl("http://test.com/file.jpg:large")) == QString("jpg"));
+		REQUIRE(getExtension(QUrl("http://test.com/index.php?image=file.jpg")) == QString("jpg"));
 	}
 	SECTION("SetExtension")
 	{
@@ -200,6 +201,7 @@ TEST_CASE("Functions")
 		REQUIRE(setExtension(QUrl("http://test.com/file"), "png") == QUrl("http://test.com/file"));
 		REQUIRE(setExtension(QUrl("http://test.com/file.jpg"), "png") == QUrl("http://test.com/file.png"));
 		REQUIRE(setExtension(QUrl("http://test.com/file.jpg?toto=1"), "png") == QUrl("http://test.com/file.png?toto=1"));
+		REQUIRE(setExtension(QUrl("http://test.com/file.jpg:large"), "png") == QUrl("http://test.com/file.png:large"));
 	}
 
 	SECTION("Levenshtein")