diff --git a/chaco/plots/contour/cntr.c b/chaco/plots/contour/cntr.c
index 21d052432..4b6d32a3d 100644
--- a/chaco/plots/contour/cntr.c
+++ b/chaco/plots/contour/cntr.c
@@ -31,7 +31,7 @@
 
 #ifdef NUMPY
 #include "numpy/arrayobject.h"
-# ifndef PyArray_SBYTE
+# ifndef PyArray_BYTE
 #  include "numpy/oldnumeric.h"
 #  include "numpy/old_defines.h"
 # endif