diff --git a/extensions/layout-debug/src/Makefile.in b/extensions/layout-debug/src/Makefile.in
index 661118b388d..659fb1bd15d 100644
--- a/extensions/layout-debug/src/Makefile.in
+++ b/extensions/layout-debug/src/Makefile.in
@@ -47,7 +47,8 @@ LIBRARY_NAME	= gkdebug
 EXPORT_LIBRARY	= 1
 IS_COMPONENT	= 1
 MODULE_NAME	= nsLayoutDebugModule
-LIBXUL_LIBRARY = 1
+LIBXUL_LIBRARY	= 1
+GRE_MODULE	= 1
 
 
 XPIDLSRCS	= \