diff --git a/src/scripting/codegeneration/codegen.cpp b/src/scripting/codegeneration/codegen.cpp
index fc59b0e97..ff2d3f8eb 100644
--- a/src/scripting/codegeneration/codegen.cpp
+++ b/src/scripting/codegeneration/codegen.cpp
@@ -8124,7 +8124,7 @@ FxExpression *FxVMFunctionCall::Resolve(FCompileContext& ctx)
 				flag = argflags[i + implicit];
 			}
 
-			FxExpression *x;
+			FxExpression *x = nullptr;
 			if (foundvarargs && (Function->Variants[0].Flags & VARF_VarArg))
 			{
 				// only cast implicit-string types for vararg, leave everything else as-is