diff --git a/overviewer_core/src/overviewer.h b/overviewer_core/src/overviewer.h
index 2453c96..c80f5b4 100644
--- a/overviewer_core/src/overviewer.h
+++ b/overviewer_core/src/overviewer.h
@@ -31,7 +31,7 @@
 
 // increment this value if you've made a change to the c extesion
 // and want to force users to rebuild
-#define OVERVIEWER_EXTENSION_VERSION 65
+#define OVERVIEWER_EXTENSION_VERSION 66
 
 /* Python PIL, and numpy headers */
 #include <Imaging.h>
diff --git a/overviewer_core/src/primitives/base.c b/overviewer_core/src/primitives/base.c
index 4527429..db4798c 100644
--- a/overviewer_core/src/primitives/base.c
+++ b/overviewer_core/src/primitives/base.c
@@ -50,10 +50,10 @@ static void
 base_finish(void* data, RenderState* state) {
     PrimitiveBase* self = (PrimitiveBase*)data;
 
-    Py_DECREF(self->foliagecolor);
-    Py_DECREF(self->grasscolor);
-    Py_DECREF(self->watercolor);
-    Py_DECREF(self->grass_texture);
+    Py_XDECREF(self->foliagecolor);
+    Py_XDECREF(self->grasscolor);
+    Py_XDECREF(self->watercolor);
+    Py_XDECREF(self->grass_texture);
 }
 
 static int