diff --git a/tests/ref/test_if.hlsl b/tests/ref/test_if.hlsl
index 6ebdcca..a61acdb 100644
--- a/tests/ref/test_if.hlsl
+++ b/tests/ref/test_if.hlsl
@@ -3,6 +3,7 @@ cbuffer cb : register(b0)
 	float4 g_f4A;
 	float4 g_f4B;
 	float4 g_f4C;
+	float4 g_f4D;
 };
 
 struct PsOut