diff --git a/include/errno.h b/include/errno.h
index 652ad67306..5a8816d0a1 100644
--- a/include/errno.h
+++ b/include/errno.h
@@ -25,7 +25,7 @@ extern int errno __errno_asm_label;
  * Return:	string describing the error. If CONFIG_ERRNO_STR is not
  *		defined an empty string is returned.
  */
-#ifdef CONFIG_ERRNO_STR
+#if CONFIG_IS_ENABLED(ERRNO_STR)
 const char *errno_str(int errno);
 #else
 static const char error_message[] = "";