diff --git a/glib/gtree.c b/glib/gtree.c
index c213b4e..5b9b56d 100644
--- a/glib/gtree.c
+++ b/glib/gtree.c
@@ -133,6 +133,13 @@ static void       g_tree_node_check                 (GTreeNode       *node,
                                                      guint            version);
 #endif
 
+guint tree_rotations = 0;
+guint g_tree_rotations () {
+  guint i = tree_rotations;
+  tree_rotations = 0;
+  return i;
+}
+
 static GTreeNode*
 g_tree_node_new (GTree   *tree,
                  gpointer key,
@@ -2015,6 +2022,9 @@ static GTreeNode*
 g_tree_node_rotate_left (GTree     *tree,
                          GTreeNode *node)
 {
+  {
+    tree_rotations++;
+  }
   GTreeNode *right;
 
   g_assert (node->v[0].version == tree->version);
@@ -2039,6 +2049,9 @@ static GTreeNode*
 g_tree_node_rotate_right (GTree     *tree,
                           GTreeNode *node)
 {
+  {
+    tree_rotations++;
+  }
   GTreeNode *left;
 
   g_assert (node->v[0].version == tree->version);