diff --git a/js/src/jstracer.cpp b/js/src/jstracer.cpp
index a5a85d80205..a88f3bc7e6c 100644
--- a/js/src/jstracer.cpp
+++ b/js/src/jstracer.cpp
@@ -198,7 +198,7 @@ JS_STATIC_ASSERT(sizeof(TraceType) == 1);
 JS_STATIC_ASSERT(offsetof(TraceNativeStorage, stack_global_buf) % 16 == 0);
 
 /* Map to translate a type tag into a printable representation. */
-static const char typeChar[] = "OIDXSNBF";
+static const char typeChar[] = "OIDXSNBUF";
 static const char tagChar[]  = "OIDISIBI";
 
 /* Blacklist parameters. */