diff --git a/examples/gltfscenerendering/gltfscenerendering.cpp b/examples/gltfscenerendering/gltfscenerendering.cpp
index 44322ad7..c4acc9bd 100644
--- a/examples/gltfscenerendering/gltfscenerendering.cpp
+++ b/examples/gltfscenerendering/gltfscenerendering.cpp
@@ -574,7 +574,7 @@ void VulkanExample::preparePipelines()
 	for (auto &material : glTFScene.materials) {
 
 		struct MaterialSpecializationData {
-			bool alphaMask;
+			VkBool32 alphaMask;
 			float alphaMaskCutoff;
 		} materialSpecializationData;