diff --git a/include/ctype.h b/include/ctype.h
index 3e560fb551..a24231030c 100644
--- a/include/ctype.h
+++ b/include/ctype.h
@@ -33,23 +33,6 @@
 #include <nuttx/compiler.h>
 #include <langinfo.h>
 
-/****************************************************************************
- * Macro Definitions
- ****************************************************************************/
-
-/* GNU libstdc++ is expecting ctype.h to define a few macros for
- * locale related functions like C++ streams.
- */
-
-#define _U  01
-#define _L  02
-#define _N  04
-#define _S  010
-#define _P  020
-#define _C  040
-#define _X  0100
-#define _B  0200
-
 /****************************************************************************
  * Inline Functions
  ****************************************************************************/
diff --git a/libs/libc/ctype/lib_ctype.c b/libs/libc/ctype/lib_ctype.c
index c0bea821c1..b11e069906 100644
--- a/libs/libc/ctype/lib_ctype.c
+++ b/libs/libc/ctype/lib_ctype.c
@@ -26,6 +26,23 @@
 
 #include <ctype.h>
 
+/****************************************************************************
+ * Macro Definitions
+ ****************************************************************************/
+
+/* GNU libstdc++ is expecting ctype.h to define a few macros for
+ * locale related functions like C++ streams.
+ */
+
+#define _U  01
+#define _L  02
+#define _N  04
+#define _S  010
+#define _P  020
+#define _C  040
+#define _X  0100
+#define _B  0200
+
 /****************************************************************************
  * Private Types
  ****************************************************************************/