diff --git a/src/Picture/Preload.hs b/src/Picture/Preload.hs
index dcc0a5262..b04adf6ac 100644
--- a/src/Picture/Preload.hs
+++ b/src/Picture/Preload.hs
@@ -212,9 +212,11 @@ frag = FragmentShader
 
 pokeWPStrat :: RenderType -> [[[Float]]]
 pokeWPStrat Render22{_unRender22 = ((x,y),(z,w))} = [[[x,y,z,w]]]
+pokeWPStrat _ = undefined
 
 pokeWPColStrat :: RenderType -> [[[Float]]]
 pokeWPColStrat Render22x4{_unRender22x4=(((x,y),(z,w)),(r,g,b,a))} = [[[x,y,z,w],[r,g,b,a]]]
+pokeWPColStrat _ = undefined
 
 poke32 :: (Point3,Point2) -> [[[Float]]]
 poke32 ((x,y,z),(a,b)) = [[[x,y,z],[a,b]]]
diff --git a/src/Picture/Tree.hs b/src/Picture/Tree.hs
index ff61fd027..65615e164 100644
--- a/src/Picture/Tree.hs
+++ b/src/Picture/Tree.hs
@@ -85,6 +85,7 @@ overPos f (RenderText vs) = RenderText $ map (\(a,b,c) -> (f a,b,c)) vs
 overPos f (RenderBezQ vs) = RenderBezQ $ map (\(a,b,c) -> (f a,b,c)) vs
 overPos f (RenderEllipse vs) = RenderEllipse $ map (first f) vs
 overPos f (RenderArc (a,b,c))  = RenderArc (f a,b,c)
+overPos _ _ = undefined
 
 overRot :: Float -> RenderType -> RenderType
 {-# INLINE overRot #-}
@@ -99,6 +100,7 @@ overCol f (RenderEllipse vs)  = RenderEllipse $ map (second f) vs
 overCol f (RenderText vs)     = RenderText    $ map (\(a,b,c) -> (a,f b,c)) vs
 overCol f (RenderBezQ vs)     = RenderBezQ    $ map (\(a,b,c) -> (a,f b,c)) vs
 overCol f (RenderArc (a,b,c)) = RenderArc (a,f b,c)
+overCol _ _ = undefined
 
 overSca :: (Point2 -> Point2) -> RenderType -> RenderType
 {-# INLINE overSca #-}
diff --git a/src/Shader.hs b/src/Shader.hs
index e1f52ba92..0c3df3e2f 100644
--- a/src/Shader.hs
+++ b/src/Shader.hs
@@ -165,7 +165,7 @@ setupVBO sizes = do
     thePtr <- mallocArray (strd * numDrawableElements)
     return $ VBO
         { _vbo = vboName
-        , _vboPoint = thePtr
+        , _vboPointer = thePtr
         , _vboAttribSizes = sizes
         }
   where
diff --git a/src/Shader/Data.hs b/src/Shader/Data.hs
index f24b3d6e3..4600e2e1f 100644
--- a/src/Shader/Data.hs
+++ b/src/Shader/Data.hs
@@ -9,6 +9,7 @@ module Shader.Data
     , ShaderTexture (..)
 -- | Lens functions
     , vao
+    , vaoVBO
     , vaoBufferTargets
 
     , shaderProgram
@@ -39,7 +40,7 @@ and a list of attribute pointer sizes.
 Vertex attributes are interleaved within the vbo. -}
 data VBO = VBO
     { _vbo      :: BufferObject
-    , _vboPoint :: Ptr Float
+    , _vboPointer :: Ptr Float
     , _vboAttribSizes :: [Int]  -- ^ It is not clear to me if this is necessary to store or not
     }