diff --git a/external/vulkancts/modules/vulkan/shaderexecutor/vktShaderPackingFunctionTests.cpp b/external/vulkancts/modules/vulkan/shaderexecutor/vktShaderPackingFunctionTests.cpp
index 1d4dd8a8b2..469369dc8a 100644
--- a/external/vulkancts/modules/vulkan/shaderexecutor/vktShaderPackingFunctionTests.cpp
+++ b/external/vulkancts/modules/vulkan/shaderexecutor/vktShaderPackingFunctionTests.cpp
@@ -856,7 +856,7 @@ class UnpackHalf2x16CaseInstance : public ShaderPackingFunctionTestInstance
 
 		if (conversion != CONVERTED && denorm)
 		{
-			if (resBits == 0)
+			if (resBits == 0 || (ref < 0 && resBits == 0x80000000UL))
 			{
 				conversion = ZERO_FLUSHED;
 				return DE_TRUE;