diff --git a/src/pythonize.cpp b/src/pythonize.cpp
index 9d41f69..2315d75 100644
--- a/src/pythonize.cpp
+++ b/src/pythonize.cpp
@@ -44,7 +44,7 @@ Pythonize::Pythonize ()
     {
         Py_Initialize();
 
-#if PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION <= 6
+#if PY_VERSION_HEX < 0x03070000
         // initialize thread support
         PyEval_InitThreads();
 #endif