diff --git a/llvm/lib/Fuzzer/FuzzerExtFunctionsDlsymWin.cpp b/llvm/lib/Fuzzer/FuzzerExtFunctionsDlsymWin.cpp
index f6c7e07..321b3ec 100644
--- a/llvm/lib/Fuzzer/FuzzerExtFunctionsDlsymWin.cpp
+++ b/llvm/lib/Fuzzer/FuzzerExtFunctionsDlsymWin.cpp
@@ -13,9 +13,11 @@
 
 #include "FuzzerExtFunctions.h"
 #include "FuzzerIO.h"
-#include "Psapi.h"
 #include "Windows.h"
 
+// This must be included after Windows.h.
+#include "Psapi.h"
+
 namespace fuzzer {
 
 ExternalFunctions::ExternalFunctions() {