diff --git a/src/Magnum/DebugTools/Test/BufferDataGLTest.cpp b/src/Magnum/DebugTools/Test/BufferDataGLTest.cpp
index 05a5ae878..27a15ec76 100644
--- a/src/Magnum/DebugTools/Test/BufferDataGLTest.cpp
+++ b/src/Magnum/DebugTools/Test/BufferDataGLTest.cpp
@@ -59,9 +59,11 @@ void BufferDataGLTest::data() {
 
     GL::Buffer buffer;
     buffer.setData(Data, GL::BufferUsage::StaticDraw);
-    const Containers::Array<Int> contents = bufferData<Int>(buffer);
+    Containers::Array<char> contents = bufferData(buffer);
     MAGNUM_VERIFY_NO_GL_ERROR();
-    CORRADE_COMPARE_AS(contents, Containers::arrayView(Data),
+    CORRADE_COMPARE_AS(
+        Containers::arrayCast<Int>(contents),
+        Containers::arrayView(Data),
         TestSuite::Compare::Container);
 }
 
@@ -76,9 +78,11 @@ void BufferDataGLTest::subData() {
 
     GL::Buffer buffer;
     buffer.setData(Data, GL::BufferUsage::StaticDraw);
-    const Containers::Array<Int> contents = bufferSubData<Int>(buffer, 4, 3);
+    Containers::Array<char> contents = bufferSubData(buffer, 4, 12);
     MAGNUM_VERIFY_NO_GL_ERROR();
-    CORRADE_COMPARE_AS(contents, Containers::arrayView(Data).slice(1, 4),
+    CORRADE_COMPARE_AS(
+        Containers::arrayCast<Int>(contents),
+        Containers::arrayView(Data).slice(1, 4),
         TestSuite::Compare::Container);
 }
 
diff --git a/src/Magnum/DebugTools/Test/TextureImageGLTest.cpp b/src/Magnum/DebugTools/Test/TextureImageGLTest.cpp
index 22458586d..7bfc0b3b3 100644
--- a/src/Magnum/DebugTools/Test/TextureImageGLTest.cpp
+++ b/src/Magnum/DebugTools/Test/TextureImageGLTest.cpp
@@ -117,13 +117,15 @@ void TextureImageGLTest::subImage2DBuffer() {
     texture.setImage(0, GL::TextureFormat::RGBA8, ImageView2D{GL::PixelFormat::RGBA, GL::PixelType::UnsignedByte, Vector2i{2}, Data2D});
 
     GL::BufferImage2D image = textureSubImage(texture, 0, {{}, Vector2i{2}}, {GL::PixelFormat::RGBA, GL::PixelType::UnsignedByte}, GL::BufferUsage::StaticRead);
-    Containers::Array<UnsignedByte> data = bufferData<UnsignedByte>(image.buffer());
+    Containers::Array<char> data = bufferData(image.buffer());
     MAGNUM_VERIFY_NO_GL_ERROR();
     CORRADE_COMPARE(image.size(), Vector2i{2});
     CORRADE_COMPARE(image.format(), GL::PixelFormat::RGBA);
     CORRADE_COMPARE(image.type(), GL::PixelType::UnsignedByte);
     CORRADE_COMPARE(image.pixelSize(), 4);
-    CORRADE_COMPARE_AS(data, Containers::arrayView(Data2D),
+    CORRADE_COMPARE_AS(
+        Containers::arrayCast<UnsignedByte>(data),
+        Containers::arrayView(Data2D),
         TestSuite::Compare::Container);
 }
 #endif
@@ -188,13 +190,15 @@ void TextureImageGLTest::subImageCubeBuffer() {
            .setImage(GL::CubeMapCoordinate::NegativeZ, 0, GL::TextureFormat::RGBA8, view);
 
     GL::BufferImage2D image = textureSubImage(texture, GL::CubeMapCoordinate::PositiveX, 0, {{}, Vector2i{2}}, {GL::PixelFormat::RGBA, GL::PixelType::UnsignedByte}, GL::BufferUsage::StaticRead);
-    Containers::Array<UnsignedByte> data = bufferData<UnsignedByte>(image.buffer());
+    Containers::Array<char> data = bufferData(image.buffer());
     MAGNUM_VERIFY_NO_GL_ERROR();
     CORRADE_COMPARE(image.size(), Vector2i{2});
     CORRADE_COMPARE(image.format(), GL::PixelFormat::RGBA);
     CORRADE_COMPARE(image.type(), GL::PixelType::UnsignedByte);
     CORRADE_COMPARE(image.pixelSize(), 4);
-    CORRADE_COMPARE_AS(data, Containers::arrayView(Data2D),
+    CORRADE_COMPARE_AS(
+        Containers::arrayCast<UnsignedByte>(data),
+        Containers::arrayView(Data2D),
         TestSuite::Compare::Container);
 }
 #endif