diff --git a/src/PythonQtPythonInclude.h b/src/PythonQtPythonInclude.h

index f4c012f..e28b8de 100644

--- a/src/PythonQtPythonInclude.h

+++ b/src/PythonQtPythonInclude.h

@@ -33,11 +33,6 @@

 #ifndef __PythonQtPythonInclude_h

 #define __PythonQtPythonInclude_h

-// Undefine macros that Python.h defines to avoid redefinition warning.

-#undef _POSIX_C_SOURCE

-#undef _POSIX_THREADS

-#undef _XOPEN_SOURCE

-

 // Undefine Qt keywords that conflict with Python headers

 #ifdef slots

 #undef slots