diff --git a/xpcom/typelib/xpidl/xpidl_header.c b/xpcom/typelib/xpidl/xpidl_header.c
index d3febeb5e29..da3daa48ea1 100644
--- a/xpcom/typelib/xpidl/xpidl_header.c
+++ b/xpcom/typelib/xpidl/xpidl_header.c
@@ -977,14 +977,10 @@ forward_dcl(TreeState *state)
 {
     IDL_tree iface = state->tree;
     const char *className = IDL_IDENT(IDL_FORWARD_DCL(iface).ident).str;
-    GSList *doc_comments = IDL_IDENT(IDL_INTERFACE(iface).ident).comments;
 
     if (!className)
         return FALSE;
 
-    if (doc_comments != NULL)
-        printlist(state->file, doc_comments);
-
     fprintf(state->file, "class %s; /* forward declaration */\n\n", className);
     return TRUE;
 }