diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 1465093ebc..a4397c028f 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -13,10 +13,6 @@ IF (WIN32)
   SET (HAVE_HTMLHELPW 1)
 ENDIF (WIN32)
 
-IF (MINGW)
-  SET (HAVE_PUTENV 1)
-ENDIF (MINGW)
-
 CHECK_INCLUDE_FILES (X11/Xlib.h HAVE_X11_XLIB_H)
 CHECK_INCLUDE_FILES (dirent.h HAVE_DIRENT_H)
 CHECK_INCLUDE_FILES (dlfcn.h HAVE_DLFCN_H)
diff --git a/src/config.h.cmake.in b/src/config.h.cmake.in
index 2c85bc4c13..0d0334bbf5 100644
--- a/src/config.h.cmake.in
+++ b/src/config.h.cmake.in
@@ -197,9 +197,6 @@
 /* Have PTHREAD_PRIO_INHERIT. */
 #cmakedefine HAVE_PTHREAD_PRIO_INHERIT 1
 
-/* Define to 1 if you have the `putenv' function. */
-#cmakedefine HAVE_PUTENV 1
-
 /* If available, contains the Python version number currently in use. */
 #cmakedefine HAVE_PYTHON 1