diff --git a/include/ctype.h b/include/ctype.h
index 6eaf6d50a90..554ece95535 100644
--- a/include/ctype.h
+++ b/include/ctype.h
@@ -35,6 +35,23 @@
 #include <nuttx/compiler.h>
 #include <langinfo.h>
 
+#ifndef _MSC_VER
+
+/* 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
+
+#endif
+
 /****************************************************************************
  * Inline Functions
  ****************************************************************************/
diff --git a/libs/libc/ctype/lib_ctype.c b/libs/libc/ctype/lib_ctype.c
index 72638694ae4..b97076cc97d 100644
--- a/libs/libc/ctype/lib_ctype.c
+++ b/libs/libc/ctype/lib_ctype.c
@@ -32,8 +32,10 @@
  * Macro Definitions
  ****************************************************************************/
 
-/* GNU libstdc++ is expecting ctype.h to define a few macros for
- * locale related functions like C++ streams.
+#if defined(_MSC_VER)
+
+/* MSVC seems to conflict with theses macro if defined in the public area.
+ * As such, they are defined in the private section to let NuttX build
  */
 
 #define _U  01
@@ -45,6 +47,8 @@
 #define _X  0100
 #define _B  0200
 
+#endif
+
 /****************************************************************************
  * Private Types
  ****************************************************************************/