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diff --git a/Engine/Source/Programs/UnrealBuildTool/Configuration/UEBuildModuleCPP.cs b/Engine/Source/Programs/UnrealBuildTool/Configuration/UEBuildModuleCPP.cs
index 4c0428ad373..6a6d4f71397 100644
--- a/Engine/Source/Programs/UnrealBuildTool/Configuration/UEBuildModuleCPP.cs
+++ b/Engine/Source/Programs/UnrealBuildTool/Configuration/UEBuildModuleCPP.cs
@@ -404,6 +404,10 @@ namespace UnrealBuildTool
// Write all the definitions to a separate file
CreateHeaderForDefinitions(CompileEnvironment, IntermediateDirectory, null, Graph);
+ if (CompileEnvironment.Definitions.Count > 0)
+ {