diff --git a/src/MagnumPlugins/AnyAudioImporter/Test/AnyAudioImporterTest.cpp b/src/MagnumPlugins/AnyAudioImporter/Test/AnyAudioImporterTest.cpp
index 1076fd43f..c1b4e094f 100644
--- a/src/MagnumPlugins/AnyAudioImporter/Test/AnyAudioImporterTest.cpp
+++ b/src/MagnumPlugins/AnyAudioImporter/Test/AnyAudioImporterTest.cpp
@@ -38,6 +38,8 @@ struct AnyImporterTest: TestSuite::Tester {
 
     void wav();
 
+    void uppercase();
+
     void unknown();
 
     /* Explicitly forbid system-wide plugin dependencies */
@@ -46,7 +48,7 @@ struct AnyImporterTest: TestSuite::Tester {
 
 AnyImporterTest::AnyImporterTest() {
     addTests({&AnyImporterTest::wav,
-
+              &AnyImporterTest::uppercase,
               &AnyImporterTest::unknown});
 
     /* Load the plugin directly from the build tree. Otherwise it's static and
@@ -72,6 +74,18 @@ void AnyImporterTest::wav() {
     CORRADE_COMPARE(importer->frequency(), 96000);
 }
 
+void AnyImporterTest::uppercase() {
+    if(!(_manager.loadState("WavAudioImporter") & PluginManager::LoadState::Loaded))
+        CORRADE_SKIP("WavAudioImporter plugin not enabled, cannot test");
+
+    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("AnyAudioImporter");
+    CORRADE_VERIFY(importer->openFile(UPPERCASE_WAV_FILE));
+
+    /* Check only parameters, as it is good enough proof that it is working */
+    CORRADE_COMPARE(importer->format(), BufferFormat::Stereo8);
+    CORRADE_COMPARE(importer->frequency(), 96000);
+}
+
 void AnyImporterTest::unknown() {
     std::ostringstream output;
     Error redirectError{&output};
diff --git a/src/MagnumPlugins/AnyAudioImporter/Test/CMakeLists.txt b/src/MagnumPlugins/AnyAudioImporter/Test/CMakeLists.txt
index 696ee79f9..bf4f4c7b8 100644
--- a/src/MagnumPlugins/AnyAudioImporter/Test/CMakeLists.txt
+++ b/src/MagnumPlugins/AnyAudioImporter/Test/CMakeLists.txt
@@ -25,8 +25,10 @@
 
 if(CORRADE_TARGET_EMSCRIPTEN OR CORRADE_TARGET_ANDROID)
     set(WAV_FILE stereo8.wav)
+    set(UPPERCASE_WAV_FILE uppercase.wav)
 else()
     set(WAV_FILE ${PROJECT_SOURCE_DIR}/src/MagnumPlugins/WavAudioImporter/Test/stereo8.wav)
+    set(UPPERCASE_WAV_FILE ${PROJECT_SOURCE_DIR}/src/MagnumPlugins/WavAudioImporter/Test/uppercase.WAV)
 endif()
 
 # CMake before 3.8 has broken $<TARGET_FILE*> expressions for iOS (see
@@ -52,7 +54,8 @@ endif()
 corrade_add_test(AnyAudioImporterTest AnyAudioImporterTest.cpp
     LIBRARIES MagnumAudio
     FILES
-        ../../WavAudioImporter/Test/stereo8.wav)
+        ../../WavAudioImporter/Test/stereo8.wav
+        ../../WavAudioImporter/Test/uppercase.WAV)
 if(NOT BUILD_PLUGINS_STATIC)
     target_include_directories(AnyAudioImporterTest PRIVATE $<TARGET_FILE_DIR:AnyAudioImporterTest>)
 else()
diff --git a/src/MagnumPlugins/AnyAudioImporter/Test/configure.h.cmake b/src/MagnumPlugins/AnyAudioImporter/Test/configure.h.cmake
index 0ab7554db..81a49c59d 100644
--- a/src/MagnumPlugins/AnyAudioImporter/Test/configure.h.cmake
+++ b/src/MagnumPlugins/AnyAudioImporter/Test/configure.h.cmake
@@ -26,3 +26,4 @@
 #cmakedefine ANYAUDIOIMPORTER_PLUGIN_FILENAME "${ANYAUDIOIMPORTER_PLUGIN_FILENAME}"
 #cmakedefine WAVAUDIOIMPORTER_PLUGIN_FILENAME "${WAVAUDIOIMPORTER_PLUGIN_FILENAME}"
 #define WAV_FILE "${WAV_FILE}"
+#define UPPERCASE_WAV_FILE "${UPPERCASE_WAV_FILE}"
diff --git a/src/MagnumPlugins/WavAudioImporter/Test/uppercase.WAV b/src/MagnumPlugins/WavAudioImporter/Test/uppercase.WAV
new file mode 100644
index 000000000..02298ef3b
Binary files /dev/null and b/src/MagnumPlugins/WavAudioImporter/Test/uppercase.WAV differ