diff --git a/mozglue/build/mozglue.def.in b/mozglue/build/mozglue.def.in
--- a/mozglue/build/mozglue.def.in
+++ b/mozglue/build/mozglue.def.in
@@ -16,9 +16,11 @@ EXPORTS
   malloc_good_size=je_malloc_good_size
   _aligned_free=je_free
   _aligned_malloc
   strndup=wrap_strndup
   strdup=wrap_strdup
   _strdup=wrap_strdup
   wcsdup=wrap_wcsdup
   _wcsdup=wrap_wcsdup
+  floor=floor_tt
+  ceil=ceil_tt
 #endif
