diff --git a/config.h.in b/config.h.in
index bf8981258..4cfd7cac1 100644
--- a/config.h.in
+++ b/config.h.in
@@ -1002,14 +1002,6 @@
 # define ignore_result(x)	(void)(x)
 #endif
 
-/* Macros to set/clear/test flags. */
-#undef SET
-#define SET(t, f)	((t) |= (f))
-#undef CLR
-#define CLR(t, f)	((t) &= ~(f))
-#undef ISSET
-#define ISSET(t, f)     ((t) & (f))
-
 /* BSD compatibility on some SVR4 systems. */
 #ifdef __svr4__
 # define BSD_COMP
diff --git a/configure.in b/configure.in
index 3032923db..3eb4e42a5 100644
--- a/configure.in
+++ b/configure.in
@@ -3778,14 +3778,6 @@ AH_BOTTOM([/*
 # define ignore_result(x)	(void)(x)
 #endif
 
-/* Macros to set/clear/test flags. */
-#undef SET
-#define SET(t, f)	((t) |= (f))
-#undef CLR
-#define CLR(t, f)	((t) &= ~(f))
-#undef ISSET
-#define ISSET(t, f)     ((t) & (f))
-
 /* BSD compatibility on some SVR4 systems. */
 #ifdef __svr4__
 # define BSD_COMP
diff --git a/include/missing.h b/include/missing.h
index 891b79cc0..6269dee54 100644
--- a/include/missing.h
+++ b/include/missing.h
@@ -158,6 +158,14 @@
 # define MAX(a,b) (((a)>(b))?(a):(b))
 #endif
 
+/* Macros to set/clear/test flags. */
+#undef SET
+#define SET(t, f)	((t) |= (f))
+#undef CLR
+#define CLR(t, f)	((t) &= ~(f))
+#undef ISSET
+#define ISSET(t, f)     ((t) & (f))
+
 /*
  * Some systems define this in <sys/param.h> but we don't include that anymore.
  */