diff --git a/WickedEngine/wiResourceManager.cpp b/WickedEngine/wiResourceManager.cpp
index eae9d41163..df9e0f583f 100644
--- a/WickedEngine/wiResourceManager.cpp
+++ b/WickedEngine/wiResourceManager.cpp
@@ -703,7 +703,14 @@ namespace wi
 							break;
 						}
 
-						if (desc.format == Format::BC5_UNORM)
+						if (desc.format == Format::BC4_UNORM || desc.format == Format::BC4_SNORM)
+						{
+							desc.swizzle.r = ComponentSwizzle::R;
+							desc.swizzle.g = ComponentSwizzle::R;
+							desc.swizzle.b = ComponentSwizzle::R;
+							desc.swizzle.a = ComponentSwizzle::ONE;
+						}
+						if (desc.format == Format::BC5_UNORM || desc.format == Format::BC5_SNORM)
 						{
 							desc.swizzle.r = ComponentSwizzle::R;
 							desc.swizzle.g = ComponentSwizzle::G;