diff --git a/libsanitizer/asan/asan_mac.cpp b/libsanitizer/asan/asan_mac.cpp
index 5d5146e0cde..6252fa20d5e 100644
--- a/libsanitizer/asan/asan_mac.cpp
+++ b/libsanitizer/asan/asan_mac.cpp
@@ -139,9 +139,11 @@ typedef void (*dispatch_mach_handler_function_t)(void *context,
                                                  dispatch_mach_reason reason,
                                                  dispatch_mach_msg_t message,
                                                  mach_error_t error);
+#if !defined(MISSING_BLOCKS_SUPPORT)
 typedef void (^dispatch_mach_handler_t)(dispatch_mach_reason reason,
                                         dispatch_mach_msg_t message,
                                         mach_error_t error);
+#endif
 
 // A wrapper for the ObjC blocks used to support libdispatch.
 typedef struct {