diff --git a/compiler-rt/lib/fuzzer/mutagen/MutagenDispatcher.cpp b/compiler-rt/lib/fuzzer/mutagen/MutagenDispatcher.cpp
index 4d3fa2b7fb8382..32b5694cc6862e 100644
--- a/compiler-rt/lib/fuzzer/mutagen/MutagenDispatcher.cpp
+++ b/compiler-rt/lib/fuzzer/mutagen/MutagenDispatcher.cpp
@@ -10,6 +10,7 @@
 
 #include "MutagenDispatcher.h"
 #include "FuzzerBuiltins.h"
+#include "FuzzerBuiltinsMsvc.h"
 #include "FuzzerPlatform.h"
 #include "MutagenUtil.h"
 #include <iomanip>