diff --git a/src/org/oscim/renderer/layer/ExtrusionLayer.java b/src/org/oscim/renderer/layer/ExtrusionLayer.java
index 03c332aa..d56bac0e 100644
--- a/src/org/oscim/renderer/layer/ExtrusionLayer.java
+++ b/src/org/oscim/renderer/layer/ExtrusionLayer.java
@@ -37,7 +37,6 @@ import android.util.Log;
 public class ExtrusionLayer extends Layer {
 	private final static String TAG = ExtrusionLayer.class.getName();
 	private static final float S = GLRenderer.COORD_SCALE;
-	private int mNumVertices = 0;
 	private final VertexPoolItem mVertices;
 	private VertexPoolItem mCurVertices;
 	private final VertexPoolItem mIndices[], mCurIndices[];
@@ -47,6 +46,7 @@ public class ExtrusionLayer extends Layer {
 	// 0. even sides, 1. odd sides, 2. roof, 3. roof outline
 	public int mIndiceCnt[] = { 0, 0, 0, 0 };
 	public int mNumIndices = 0;
+	public int mNumVertices = 0;
 
 	public int mIndicesBufferID;
 	public int mVertexBufferID;
@@ -341,7 +341,6 @@ public class ExtrusionLayer extends Layer {
 		}
 
 		mCurVertices.used = v;
-
 		mNumVertices += vertexCnt;
 		return convex;
 	}
diff --git a/src/org/oscim/renderer/overlays/ExtrusionOverlay.java b/src/org/oscim/renderer/overlays/ExtrusionOverlay.java
index 13ebb3ad..3e2de3a3 100644
--- a/src/org/oscim/renderer/overlays/ExtrusionOverlay.java
+++ b/src/org/oscim/renderer/overlays/ExtrusionOverlay.java
@@ -55,7 +55,7 @@ public class ExtrusionOverlay extends RenderOverlay {
 	private boolean initialized = false;
 
 	// FIXME sum up size used while filling layer only up to:
-	private final int BUFFERSIZE = 65536 * 2;
+	public int mBufferSize = 65536;
 	private TileSet mTileSet;
 	private ShortBuffer mShortBuffer;
 	private MapTile[] mTiles;
@@ -86,7 +86,7 @@ public class ExtrusionOverlay extends RenderOverlay {
 				hLightPosition[i] = GLES20.glGetAttribLocation(shaderProgram[i], "a_light");
 			}
 
-			ByteBuffer buf = ByteBuffer.allocateDirect(BUFFERSIZE)
+			ByteBuffer buf = ByteBuffer.allocateDirect(mBufferSize)
 					.order(ByteOrder.nativeOrder());
 
 			mShortBuffer = buf.asShortBuffer();
@@ -116,6 +116,15 @@ public class ExtrusionOverlay extends RenderOverlay {
 					continue;
 
 				if (!el.compiled) {
+					int verticesBytes = el.mNumVertices * 8 * 2;
+					if (verticesBytes > mBufferSize) {
+						mBufferSize = verticesBytes;
+						Log.d(TAG, "realloc extrusion buffer " + verticesBytes);
+						ByteBuffer buf = ByteBuffer.allocateDirect(verticesBytes)
+								.order(ByteOrder.nativeOrder());
+
+						mShortBuffer = buf.asShortBuffer();
+					}
 					el.compile(mShortBuffer);
 					GlUtils.checkGlError("...");
 				}