diff --git a/gdspy/clipper.cpp b/gdspy/clipper.cpp
index 768d7d0..733d598 100644
--- a/gdspy/clipper.cpp
+++ b/gdspy/clipper.cpp
@@ -38,13 +38,13 @@
 *                                                                              *
 *******************************************************************************/
 
-// Begin of GDSPY additional headers
+// Begin of GDSPY additions
+#define _USE_MATH_DEFINES
 #include <Python.h>
-#define DEBUG 1
 #ifdef DEBUG
 #include <iostream>
 #endif //DEBUG
-// End of GDSPY additional headers
+// End of GDSPY additions
 
 #include "clipper.hpp"
 #include <cmath>
diff --git a/gdspy/clipper.hpp b/gdspy/clipper.hpp
index df1f813..55d59c8 100644
--- a/gdspy/clipper.hpp
+++ b/gdspy/clipper.hpp
@@ -49,6 +49,10 @@
 //use_deprecated: Enables temporary support for the obsolete functions
 //#define use_deprecated  
 
+// Begin of GDSPY additions
+#define _USE_MATH_DEFINES
+// End of GDSPY additions
+
 #include <vector>
 #include <list>
 #include <set>