1 files changed, 7 insertions, 0 deletions

diff --git a/src/alloc.c b/src/alloc.c
index 281288e69db..c61a0d9fa83 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -4266,6 +4266,13 @@ Garbage collection happens automatically if you cons more than
   mark_stack ();
 #endif
 
+#ifdef USE_GTK
+  {
+    extern void xg_mark_data ();
+    xg_mark_data ();
+  }
+#endif
+
   gc_sweep ();
 
   /* Clear the mark bits that we set in certain root slots.  */