diff --git a/include/dw_std.h b/include/dw_std.h
index 22e83c3fd96ae8551d1053ff886cd5a8ac33f031..e3f38e05b508ab7cf472b425a4f570862851a820 100644
--- a/include/dw_std.h
+++ b/include/dw_std.h
@@ -18,7 +18,7 @@
 #ifndef __DW_STANDARD_DEFINES__
 #define __DW_STANDARD_DEFINES__
 
-#if defined(MATLAB_MEXFILE) || defined(OCTAVE_MEXFILE)
+#if defined(MATLAB_MEX_FILE) || defined(OCTAVE_MEX_FILE)
 
 #include <dynmex.h>
 #include <dynblas.h>