diff --git a/toolkit/crashreporter/client/ping.cpp b/toolkit/crashreporter/client/ping.cpp
--- a/toolkit/crashreporter/client/ping.cpp
+++ b/toolkit/crashreporter/client/ping.cpp
@@ -51,11 +51,11 @@
   CFUUIDBytes bytes = CFUUIDGetUUIDBytes(uuid);
   memcpy(&id, &bytes, sizeof(UUID));
 
   CFRelease(uuid);
 #elif defined(HAVE_ARC4RANDOM_BUF)  // Android, BSD, ...
-  arc4random_buf(id, sizeof(UUID));
+  arc4random_buf(&id, sizeof(UUID));
 #else                               // Linux
   int fd = open("/dev/urandom", O_RDONLY);
 
   if (fd == -1) {
     return "";