--- a/mozilla-release/toolkit/crashreporter/google-breakpad/src/third_party/lss/linux_syscall_support.h
+++ b/mozilla-release/toolkit/crashreporter/google-breakpad/src/third_party/lss/linux_syscall_support.h
@@ -2814,7 +2814,7 @@
     LSS_INLINE _syscall6(void*, mmap,              void*, s,
                          size_t,                   l, int,               p,
                          int,                      f, int,               d,
-                         __off64_t,                o)
+                         off64_t,                o)
 
     LSS_INLINE _syscall4(int, newfstatat,         int,   d,
                          const char *,            p,