diff --git a/Include/allobjects.h b/Include/allobjects.h
index 87b978636dd..d19eb2337d3 100644
--- a/Include/allobjects.h
+++ b/Include/allobjects.h
@@ -28,9 +28,7 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 /* Include nearly all Python header files */
 
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif
 
 /* config.h may or may not define DL_IMPORT */
 #ifndef DL_IMPORT	/* declarations for DLL import/export */
diff --git a/Include/pgenheaders.h b/Include/pgenheaders.h
index cc4386f6b9d..6a3cdad3dac 100644
--- a/Include/pgenheaders.h
+++ b/Include/pgenheaders.h
@@ -30,9 +30,7 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 /* Include files and extern declarations used by most of the parser. */
 
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif
 
 /* config.h may or may not define DL_IMPORT */
 #ifndef DL_IMPORT	/* declarations for DLL import/export */
diff --git a/Modules/md5c.c b/Modules/md5c.c
index d7c7e4fb277..81036ebd76e 100644
--- a/Modules/md5c.c
+++ b/Modules/md5c.c
@@ -23,9 +23,7 @@ These notices must be retained in any copies of any part of this
 documentation and/or software.
  */
 
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif
 #include "md5.h"
 
 /* Constants for MD5Transform routine.
diff --git a/Modules/regexpr.c b/Modules/regexpr.c
index 84f0b9489e1..4f497f108b0 100644
--- a/Modules/regexpr.c
+++ b/Modules/regexpr.c
@@ -24,9 +24,7 @@ from GNU regexp.
 
 */
 
-#ifdef HAVE_CONFIG_H
 #include "config.h" /* For Win* specific redefinition of printf c.s. */
-#endif
 
 #include "myproto.h" /* For PROTO macro --Guido */
 
diff --git a/Parser/intrcheck.c b/Parser/intrcheck.c
index dd53a1acc26..c3fabe7abdc 100644
--- a/Parser/intrcheck.c
+++ b/Parser/intrcheck.c
@@ -24,10 +24,7 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 /* Check for interrupts */
 
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif
-
 #include "myproto.h"
 #include "intrcheck.h"
 
diff --git a/Parser/myreadline.c b/Parser/myreadline.c
index d210d8b9639..75a43ab9dd0 100644
--- a/Parser/myreadline.c
+++ b/Parser/myreadline.c
@@ -32,9 +32,7 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
    - a malloc'ed string ending in \n normally
 */
 
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif
 
 #include <stdio.h>
 #include <string.h>
diff --git a/Python/atof.c b/Python/atof.c
index 894490a47b9..f7e9b7d94e2 100644
--- a/Python/atof.c
+++ b/Python/atof.c
@@ -27,9 +27,7 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
    and is slow and inaccurate.
    But it's good enough for the occasional string literal... */
 
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif
 
 #include <ctype.h>
 
diff --git a/Python/fmod.c b/Python/fmod.c
index 777166bcb63..ffe97f57376 100644
--- a/Python/fmod.c
+++ b/Python/fmod.c
@@ -24,9 +24,7 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 /* Portable fmod(x, y) implementation for systems that don't have it */
 
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif
 
 #include "mymath.h"
 #include <errno.h>
diff --git a/Python/getmtime.c b/Python/getmtime.c
index fde6a3b9c22..1e27b070535 100644
--- a/Python/getmtime.c
+++ b/Python/getmtime.c
@@ -26,9 +26,7 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 /* (A separate file because this may be OS dependent) */
 
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif
 
 #include <sys/types.h>
 #include <sys/stat.h>
diff --git a/Python/mystrtoul.c b/Python/mystrtoul.c
index a6462837899..5dfade8282c 100644
--- a/Python/mystrtoul.c
+++ b/Python/mystrtoul.c
@@ -22,9 +22,7 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 ******************************************************************/
 
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif
 
 /* Convert a possibly signed character to a nonnegative int */
 /* XXX This assumes characters are 8 bits wide */
diff --git a/Python/strtod.c b/Python/strtod.c
index dddc98bb567..1c475e5ca35 100644
--- a/Python/strtod.c
+++ b/Python/strtod.c
@@ -1,6 +1,4 @@
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif
 
 /* comp.sources.misc strtod(), as posted in comp.lang.tcl,
    with bugfix for "123000.0" and acceptance of space after 'e' sign nuked.
diff --git a/Python/thread.c b/Python/thread.c
index 2d80b097e94..c6f8c51e757 100644
--- a/Python/thread.c
+++ b/Python/thread.c
@@ -28,9 +28,7 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
    which is included by this file dependent on config settings.
    Stuff shared by all thread_*.h files is collected here. */
 
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif
 
 #include <stdio.h>