diff --git a/mozilla/layout/build/nsLayoutDLF.cpp b/mozilla/layout/build/nsLayoutDLF.cpp
index 271ffce94a7..525cc76a0b1 100644
--- a/mozilla/layout/build/nsLayoutDLF.cpp
+++ b/mozilla/layout/build/nsLayoutDLF.cpp
@@ -84,6 +84,7 @@ static char* gImageTypes[] = {
   "image/jpeg",
   "image/png",
   "image/x-art",
+  "image/x-jg",
   0
 };