diff --git a/include/qbsp/portals.hh b/include/qbsp/portals.hh
index f7eee628..cf1c4c5b 100644
--- a/include/qbsp/portals.hh
+++ b/include/qbsp/portals.hh
@@ -54,7 +54,6 @@ bool Portal_EntityFlood(const portal_t *p, int32_t s);
 void MakeNodePortal(tree_t *tree, node_t *node, portalstats_t &stats);
 void SplitNodePortals(tree_t *tree, node_t *node, portalstats_t &stats);
 void MakeTreePortals(tree_t *tree);
-void FreeTreePortals(tree_t *tree);
 void AssertNoPortals(tree_t *tree);
 void MakeHeadnodePortals(tree_t *tree);
 void EmitAreaPortals(node_t *headnode);
diff --git a/include/qbsp/tree.hh b/include/qbsp/tree.hh
index e97a9f82..50d58be3 100644
--- a/include/qbsp/tree.hh
+++ b/include/qbsp/tree.hh
@@ -46,5 +46,6 @@ struct tree_t
     portal_t *create_portal();
 };
 
+void FreeTreePortals(tree_t *tree);
 void DetailToSolid(node_t *node);
 void PruneNodes(node_t *node);
diff --git a/qbsp/portals.cc b/qbsp/portals.cc
index 7b70daee..39a65663 100644
--- a/qbsp/portals.cc
+++ b/qbsp/portals.cc
@@ -478,30 +478,6 @@ void AssertNoPortals(tree_t *tree)
     Q_assert(tree->portals.empty());
 }
 
-/*
-==================
-FreeTreePortals_r
-
-==================
-*/
-static void ClearNodePortals_r(node_t *node)
-{
-    if (node->planenum != PLANENUM_LEAF) {
-        ClearNodePortals_r(node->children[0].get());
-        ClearNodePortals_r(node->children[1].get());
-    }
-
-    node->portals = nullptr;
-}
-
-void FreeTreePortals(tree_t *tree)
-{
-    ClearNodePortals_r(tree->headnode.get());
-    tree->outside_node.portals = nullptr;
-
-    tree->portals.clear();
-}
-
 /*
 =========================================================
 
diff --git a/qbsp/tree.cc b/qbsp/tree.cc
index fcce4f41..c74031d5 100644
--- a/qbsp/tree.cc
+++ b/qbsp/tree.cc
@@ -37,6 +37,30 @@ portal_t *tree_t::create_portal()
     return result;
 }
 
+/*
+==================
+FreeTreePortals_r
+
+==================
+*/
+static void ClearNodePortals_r(node_t *node)
+{
+    if (node->planenum != PLANENUM_LEAF) {
+        ClearNodePortals_r(node->children[0].get());
+        ClearNodePortals_r(node->children[1].get());
+    }
+
+    node->portals = nullptr;
+}
+
+void FreeTreePortals(tree_t *tree)
+{
+    ClearNodePortals_r(tree->headnode.get());
+    tree->outside_node.portals = nullptr;
+
+    tree->portals.clear();
+}
+
 //============================================================================
 
 static void ConvertNodeToLeaf(node_t *node, const contentflags_t &contents)