diff --git a/src/mcedit2/rendering/blockmodels.pyx b/src/mcedit2/rendering/blockmodels.pyx
index 89bf84a..7b8d0f3 100644
--- a/src/mcedit2/rendering/blockmodels.pyx
+++ b/src/mcedit2/rendering/blockmodels.pyx
@@ -1,3 +1,4 @@
+#cython: boundscheck=False
 """
     blockmodels
 """
diff --git a/src/mcedit2/rendering/modelmesh.pyx b/src/mcedit2/rendering/modelmesh.pyx
index 91aaccf..ec96b9c 100644
--- a/src/mcedit2/rendering/modelmesh.pyx
+++ b/src/mcedit2/rendering/modelmesh.pyx
@@ -1,3 +1,4 @@
+#cython: boundscheck=False
 """
     ${NAME}
 """