diff --git a/include/qbsp/csg.hh b/include/qbsp/csg.hh
index 9fb99e80..41110e77 100644
--- a/include/qbsp/csg.hh
+++ b/include/qbsp/csg.hh
@@ -34,8 +34,5 @@ struct side_t;
 
 std::unique_ptr<face_t> NewFaceFromFace(const face_t *in);
 std::unique_ptr<face_t> CopyFace(const face_t* in);
-std::unique_ptr<face_t> MirrorFace(const face_t *face);
 std::tuple<std::unique_ptr<face_t>, std::unique_ptr<face_t>> SplitFace(std::unique_ptr<face_t> in, const qplane3d &split);
 void UpdateFaceSphere(face_t *in);
-bool BrushGE(const bspbrush_t &a, const bspbrush_t &b);
-std::vector<std::unique_ptr<bspbrush_t>> ChopBrushes(const std::vector<std::unique_ptr<bspbrush_t>> &input);
diff --git a/include/qbsp/faces.hh b/include/qbsp/faces.hh
index cc893256..9c6ec57b 100644
--- a/include/qbsp/faces.hh
+++ b/include/qbsp/faces.hh
@@ -27,7 +27,5 @@ struct node_t;
 class mapentity_t;
 struct face_t;
 
-std::list<face_t *> SubdivideFace(face_t *f);
-void MakeVisibleFaces(mapentity_t *entity, node_t *headnode);
 void MakeMarkFaces(mapentity_t* entity, node_t* headnode);
 void MakeFaces(node_t *node);
diff --git a/qbsp/csg.cc b/qbsp/csg.cc
index 27b56211..be2935e9 100644
--- a/qbsp/csg.cc
+++ b/qbsp/csg.cc
@@ -123,12 +123,3 @@ std::tuple<std::unique_ptr<face_t>, std::unique_ptr<face_t>> SplitFace(std::uniq
 
     return {std::move(new_front), std::move(new_back)};
 }
-
-std::unique_ptr<face_t> MirrorFace(const face_t *face)
-{
-    auto newface = NewFaceFromFace(face);
-    newface->w = face->w.flip();
-    newface->planeside = static_cast<planeside_t>(face->planeside ^ 1);
-
-    return newface;
-}
diff --git a/qbsp/faces.cc b/qbsp/faces.cc
index 2f77aced..ea615c7b 100644
--- a/qbsp/faces.cc
+++ b/qbsp/faces.cc
@@ -59,7 +59,7 @@ If the face is >256 in either texture direction, carve a valid sized
 piece off and insert the remainder in the next link
 ===============
 */
-std::list<std::unique_ptr<face_t>> SubdivideFace(std::unique_ptr<face_t> f)
+static std::list<std::unique_ptr<face_t>> SubdivideFace(std::unique_ptr<face_t> f)
 {
     vec_t mins, maxs;
     vec_t v;