diff --git a/include/nuttx/compiler.h b/include/nuttx/compiler.h
index eb7aabd2a48..fbc3dd3c08c 100644
--- a/include/nuttx/compiler.h
+++ b/include/nuttx/compiler.h
@@ -127,7 +127,9 @@
                                         } \
                                       while (0)
 
-#    define fortify_va_arg_pack __builtin_va_arg_pack
+#    if !defined(__clang__)
+#      define fortify_va_arg_pack __builtin_va_arg_pack
+#    endif
 #    define fortify_real(fn) __typeof__(fn) __real_##fn __asm__(#fn)
 #    define fortify_function(fn) fortify_real(fn); \
                                  extern __inline__ no_builtin(#fn) \
diff --git a/include/stdio.h b/include/stdio.h
index a7d3115d433..65b11586964 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -318,6 +318,7 @@ fortify_function(vsprintf) int vsprintf(FAR char *dest,
   return ret;
 }
 
+#ifdef fortify_va_arg_pack
 fortify_function(snprintf) int snprintf(FAR char *buf, size_t size,
                                         FAR const IPTR char *format, ...)
 {
@@ -336,6 +337,7 @@ fortify_function(sprintf) int sprintf(FAR char *buf,
   return ret;
 }
 #endif
+#endif
 
 #undef EXTERN
 #if defined(__cplusplus)