diff --git a/config2.h.in b/config2.h.in
index 5c04c130..93ea2b4b 100644
--- a/config2.h.in
+++ b/config2.h.in
@@ -642,9 +642,6 @@
 /* Define to 1 if you have the `snprintf' function. */
 #mesondefine HAVE_SNPRINTF
 
-/* Define to 1 if you have the <stddef.h> header file. */
-#mesondefine HAVE_STDDEF_H
-
 /* Define to 1 if you have the <stdint.h> header file. */
 #mesondefine HAVE_STDINT_H
 
diff --git a/src/intl/gettext/localcharset.c b/src/intl/gettext/localcharset.c
index 5dad1f0a..95e05bf2 100644
--- a/src/intl/gettext/localcharset.c
+++ b/src/intl/gettext/localcharset.c
@@ -23,9 +23,7 @@
 #include "config.h"
 #endif
 
-#if HAVE_STDDEF_H
 #include <stddef.h>
-#endif
 
 #include <stdio.h>
 #if HAVE_STRING_H
diff --git a/src/osdep/generic.h b/src/osdep/generic.h
index a61bac06..ac4fe42c 100644
--- a/src/osdep/generic.h
+++ b/src/osdep/generic.h
@@ -9,9 +9,7 @@
 
 #include <limits.h> /* may contain PIPE_BUF definition on some systems */
 
-#ifdef HAVE_STDDEF_H
 #include <stddef.h> /* may contain offsetof() */
-#endif
 
 #ifdef __cplusplus
 extern "C" {