diff --git a/src/Magnum/Shaders/Test/DistanceFieldVectorGLTest.cpp b/src/Magnum/Shaders/Test/DistanceFieldVectorGLTest.cpp
index 19c334463..0a5a751b5 100644
--- a/src/Magnum/Shaders/Test/DistanceFieldVectorGLTest.cpp
+++ b/src/Magnum/Shaders/Test/DistanceFieldVectorGLTest.cpp
@@ -129,7 +129,7 @@ struct DistanceFieldVectorGLTest: GL::OpenGLTester {
 
     private:
         PluginManager::Manager<Trade::AbstractImporter> _manager{"nonexistent"};
-        std::string _testDir;
+        Containers::String _testDir;
 
         GL::Renderbuffer _color{NoCreate};
         #ifndef MAGNUM_TARGET_GLES2