diff --git a/renderdoc/driver/d3d11/d3d11_resources.cpp b/renderdoc/driver/d3d11/d3d11_resources.cpp
index b4e8ddc25..308200028 100644
--- a/renderdoc/driver/d3d11/d3d11_resources.cpp
+++ b/renderdoc/driver/d3d11/d3d11_resources.cpp
@@ -500,8 +500,12 @@ UINT GetByteSize(int Width, int Height, int Depth, DXGI_FORMAT Format, int mip)
 		case DXGI_FORMAT_B4G4R4A4_UNORM:
 			ret *= 2; // 4 channels, half a byte each
 			break;
+		case DXGI_FORMAT_UNKNOWN:
+			RDCERR("Getting byte size of unknown DXGI format");
+			ret = 0;
+			break;
 		default:
-			RDCFATAL("Unrecognised DXGI Format: %d", Format);
+			RDCERR("Unrecognised DXGI Format: %d", Format);
 			break;
 	}