diff --git a/compiler-rt/lib/fuzzer/FuzzerDefs.h b/compiler-rt/lib/fuzzer/FuzzerDefs.h
--- a/compiler-rt/lib/fuzzer/FuzzerDefs.h
+++ b/compiler-rt/lib/fuzzer/FuzzerDefs.h
@@ -20,6 +20,7 @@
 #include <string>
 #include <vector>
 
+#include "FuzzerPlatform.h"
 
 namespace fuzzer {
 
@@ -62,7 +63,8 @@
 typedef Vector<Unit> UnitVector;
 typedef int (*UserCallback)(const uint8_t *Data, size_t Size);
 
-int FuzzerDriver(int *argc, char ***argv, UserCallback Callback);
+ATTRIBUTE_INTERFACE int FuzzerDriver(int *argc, char ***argv,
+                                     UserCallback Callback);
 
 uint8_t *ExtraCountersBegin();
 uint8_t *ExtraCountersEnd();