diff --git a/Modules/rotatingtree.c b/Modules/rotatingtree.c
index 39c6dd5..07e08bc 100644
--- a/Modules/rotatingtree.c
+++ b/Modules/rotatingtree.c
@@ -14,14 +14,14 @@
 static int
 randombits(int bits)
 {
-	int result;
-	if (random_stream < (1U << bits)) {
-		random_value *= 1082527;
-		random_stream = random_value;
-	}
-	result = random_stream & ((1<<bits)-1);
-	random_stream >>= bits;
-	return result;
+    int result;
+    if (random_stream < (1U << bits)) {
+        random_value *= 1082527;
+        random_stream = random_value;
+    }
+    result = random_stream & ((1<<bits)-1);
+    random_stream >>= bits;
+    return result;
 }
 
 
@@ -30,15 +30,15 @@
 void
 RotatingTree_Add(rotating_node_t **root, rotating_node_t *node)
 {
-	while (*root != NULL) {
-		if (KEY_LOWER_THAN(node->key, (*root)->key))
-			root = &((*root)->left);
-		else
-			root = &((*root)->right);
-	}
-	node->left = NULL;
-	node->right = NULL;
-	*root = node;
+    while (*root != NULL) {
+        if (KEY_LOWER_THAN(node->key, (*root)->key))
+            root = &((*root)->left);
+        else
+            root = &((*root)->right);
+    }
+    node->left = NULL;
+    node->right = NULL;
+    *root = node;
 }
 
 /* Locate the node with the given key.  This is the most complicated
@@ -47,57 +47,57 @@
 rotating_node_t *
 RotatingTree_Get(rotating_node_t **root, void *key)
 {
-	if (randombits(3) != 4) {
-		/* Fast path, no rebalancing */
-		rotating_node_t *node = *root;
-		while (node != NULL) {
-			if (node->key == key)
-				return node;
-			if (KEY_LOWER_THAN(key, node->key))
-				node = node->left;
-			else
-				node = node->right;
-		}
-		return NULL;
-	}
-	else {
-		rotating_node_t **pnode = root;
-		rotating_node_t *node = *pnode;
-		rotating_node_t *next;
-		int rotate;
-		if (node == NULL)
-			return NULL;
-		while (1) {
-			if (node->key == key)
-				return node;
-			rotate = !randombits(1);
-			if (KEY_LOWER_THAN(key, node->key)) {
-				next = node->left;
-				if (next == NULL)
-					return NULL;
-				if (rotate) {
-					node->left = next->right;
-					next->right = node;
-					*pnode = next;
-				}
-				else
-					pnode = &(node->left);
-			}
-			else {
-				next = node->right;
-				if (next == NULL)
-					return NULL;
-				if (rotate) {
-					node->right = next->left;
-					next->left = node;
-					*pnode = next;
-				}
-				else
-					pnode = &(node->right);
-			}
-			node = next;
-		}
-	}
+    if (randombits(3) != 4) {
+        /* Fast path, no rebalancing */
+        rotating_node_t *node = *root;
+        while (node != NULL) {
+            if (node->key == key)
+                return node;
+            if (KEY_LOWER_THAN(key, node->key))
+                node = node->left;
+            else
+                node = node->right;
+        }
+        return NULL;
+    }
+    else {
+        rotating_node_t **pnode = root;
+        rotating_node_t *node = *pnode;
+        rotating_node_t *next;
+        int rotate;
+        if (node == NULL)
+            return NULL;
+        while (1) {
+            if (node->key == key)
+                return node;
+            rotate = !randombits(1);
+            if (KEY_LOWER_THAN(key, node->key)) {
+                next = node->left;
+                if (next == NULL)
+                    return NULL;
+                if (rotate) {
+                    node->left = next->right;
+                    next->right = node;
+                    *pnode = next;
+                }
+                else
+                    pnode = &(node->left);
+            }
+            else {
+                next = node->right;
+                if (next == NULL)
+                    return NULL;
+                if (rotate) {
+                    node->right = next->left;
+                    next->left = node;
+                    *pnode = next;
+                }
+                else
+                    pnode = &(node->right);
+            }
+            node = next;
+        }
+    }
 }
 
 /* Enumerate all nodes in the tree.  The callback enumfn() should return
@@ -105,17 +105,17 @@
    A non-zero value is directly returned by RotatingTree_Enum(). */
 int
 RotatingTree_Enum(rotating_node_t *root, rotating_tree_enum_fn enumfn,
-		  void *arg)
+                  void *arg)
 {
-	int result;
-	rotating_node_t *node;
-	while (root != NULL) {
-		result = RotatingTree_Enum(root->left, enumfn, arg);
-		if (result != 0) return result;
-		node = root->right;
-		result = enumfn(root, arg);
-		if (result != 0) return result;
-		root = node;
-	}
-	return 0;
+    int result;
+    rotating_node_t *node;
+    while (root != NULL) {
+        result = RotatingTree_Enum(root->left, enumfn, arg);
+        if (result != 0) return result;
+        node = root->right;
+        result = enumfn(root, arg);
+        if (result != 0) return result;
+        root = node;
+    }
+    return 0;
 }