diff --git a/src/Magnum/ShaderTools/Test/AbstractConverterTest.cpp b/src/Magnum/ShaderTools/Test/AbstractConverterTest.cpp
index 8d87988a3..2385e2612 100644
--- a/src/Magnum/ShaderTools/Test/AbstractConverterTest.cpp
+++ b/src/Magnum/ShaderTools/Test/AbstractConverterTest.cpp
@@ -178,6 +178,7 @@ struct AbstractConverterTest: TestSuite::Tester {
 
     void debugFeature();
     void debugFeatures();
+    void debugFeaturesSupersets();
     void debugFlag();
     void debugFlags();
     void debugFormat();
@@ -317,6 +318,7 @@ AbstractConverterTest::AbstractConverterTest() {
 
               &AbstractConverterTest::debugFeature,
               &AbstractConverterTest::debugFeatures,
+              &AbstractConverterTest::debugFeaturesSupersets,
               &AbstractConverterTest::debugFlag,
               &AbstractConverterTest::debugFlags,
               &AbstractConverterTest::debugFormat});
@@ -3415,6 +3417,29 @@ void AbstractConverterTest::debugFeatures() {
     CORRADE_COMPARE(out.str(), "ShaderTools::ConverterFeature::ValidateData|ShaderTools::ConverterFeature::ConvertFile ShaderTools::ConverterFeatures{}\n");
 }
 
+void AbstractConverterTest::debugFeaturesSupersets() {
+    /* ValidateData is a superset of ValidateFile, so only one should be
+       printed */
+    {
+        std::ostringstream out;
+        Debug{&out} << (ConverterFeature::ValidateData|ConverterFeature::ValidateFile);
+        CORRADE_COMPARE(out.str(), "ShaderTools::ConverterFeature::ValidateData\n");
+
+    /* ConvertData is a superset of ConvertFile, so only one should be
+       printed */
+    } {
+        std::ostringstream out;
+        Debug{&out} << (ConverterFeature::ConvertData|ConverterFeature::ConvertFile);
+        CORRADE_COMPARE(out.str(), "ShaderTools::ConverterFeature::ConvertData\n");
+
+    /* LinkData is a superset of LinkFile, so only one should be printed */
+    } {
+        std::ostringstream out;
+        Debug{&out} << (ConverterFeature::LinkData|ConverterFeature::LinkFile);
+        CORRADE_COMPARE(out.str(), "ShaderTools::ConverterFeature::LinkData\n");
+    }
+}
+
 void AbstractConverterTest::debugFlag() {
     std::ostringstream out;
 
diff --git a/src/Magnum/Trade/Test/AbstractImageConverterTest.cpp b/src/Magnum/Trade/Test/AbstractImageConverterTest.cpp
index ce066f722..3bf7729d8 100644
--- a/src/Magnum/Trade/Test/AbstractImageConverterTest.cpp
+++ b/src/Magnum/Trade/Test/AbstractImageConverterTest.cpp
@@ -141,6 +141,7 @@ struct AbstractImageConverterTest: TestSuite::Tester {
 
     void debugFeature();
     void debugFeatures();
+    void debugFeaturesSupersets();
     void debugFlag();
     void debugFlags();
 };
@@ -240,6 +241,7 @@ AbstractImageConverterTest::AbstractImageConverterTest() {
 
               &AbstractImageConverterTest::debugFeature,
               &AbstractImageConverterTest::debugFeatures,
+              &AbstractImageConverterTest::debugFeaturesSupersets,
               &AbstractImageConverterTest::debugFlag,
               &AbstractImageConverterTest::debugFlags});
 
@@ -1726,6 +1728,23 @@ void AbstractImageConverterTest::debugFeatures() {
     CORRADE_COMPARE(out.str(), "Trade::ImageConverterFeature::Convert2DToData|Trade::ImageConverterFeature::ConvertCompressed2DToFile Trade::ImageConverterFeatures{}\n");
 }
 
+void AbstractImageConverterTest::debugFeaturesSupersets() {
+    /* Convert*DToData is a superset of Convert*DToFile, so only one should be
+       printed */
+    {
+        std::ostringstream out;
+        Debug{&out} << (ImageConverterFeature::Convert2DToData|ImageConverterFeature::Convert2DToFile);
+        CORRADE_COMPARE(out.str(), "Trade::ImageConverterFeature::Convert2DToData\n");
+
+    /* ConvertCompressed*DToData is a superset of ConvertCompressed*DToFile, so
+       only one should be printed */
+    } {
+        std::ostringstream out;
+        Debug{&out} << (ImageConverterFeature::ConvertCompressed1DToData|ImageConverterFeature::ConvertCompressed1DToFile);
+        CORRADE_COMPARE(out.str(), "Trade::ImageConverterFeature::ConvertCompressed1DToData\n");
+    }
+}
+
 void AbstractImageConverterTest::debugFlag() {
     std::ostringstream out;
 
diff --git a/src/Magnum/Trade/Test/AbstractSceneConverterTest.cpp b/src/Magnum/Trade/Test/AbstractSceneConverterTest.cpp
index 6aca0b7ba..dcf423b97 100644
--- a/src/Magnum/Trade/Test/AbstractSceneConverterTest.cpp
+++ b/src/Magnum/Trade/Test/AbstractSceneConverterTest.cpp
@@ -75,6 +75,7 @@ struct AbstractSceneConverterTest: TestSuite::Tester {
 
     void debugFeature();
     void debugFeatures();
+    void debugFeaturesSupersets();
     void debugFlag();
     void debugFlags();
 };
@@ -110,6 +111,7 @@ AbstractSceneConverterTest::AbstractSceneConverterTest() {
 
               &AbstractSceneConverterTest::debugFeature,
               &AbstractSceneConverterTest::debugFeatures,
+              &AbstractSceneConverterTest::debugFeaturesSupersets,
               &AbstractSceneConverterTest::debugFlag,
               &AbstractSceneConverterTest::debugFlags});
 
@@ -549,6 +551,16 @@ void AbstractSceneConverterTest::debugFeatures() {
     CORRADE_COMPARE(out.str(), "Trade::SceneConverterFeature::ConvertMesh|Trade::SceneConverterFeature::ConvertMeshToFile Trade::SceneConverterFeatures{}\n");
 }
 
+void AbstractSceneConverterTest::debugFeaturesSupersets() {
+    /* ConvertMeshToData is a superset of ConvertMeshToFile, so only one should
+       be printed */
+    {
+        std::ostringstream out;
+        Debug{&out} << (SceneConverterFeature::ConvertMeshToData|SceneConverterFeature::ConvertMeshToFile);
+        CORRADE_COMPARE(out.str(), "Trade::SceneConverterFeature::ConvertMeshToData\n");
+    }
+}
+
 void AbstractSceneConverterTest::debugFlag() {
     std::ostringstream out;