diff --git a/tools/fuzzing/libfuzzer/harness/LibFuzzerRegistry.h b/tools/fuzzing/libfuzzer/harness/LibFuzzerRegistry.h
index e459ade33e71..346aea24b6ca 100644
--- a/tools/fuzzing/libfuzzer/harness/LibFuzzerRegistry.h
+++ b/tools/fuzzing/libfuzzer/harness/LibFuzzerRegistry.h
@@ -12,6 +12,7 @@
 #include <utility>
 
 #include "mozilla/Attributes.h"
+#include "mozilla/Types.h"
 
 typedef int(*LibFuzzerMain)(int, char**);
 typedef int(*LibFuzzerInitFunc)(int*, char***);