diff --git a/config.h.cmake b/config.h.cmake
index 5b75e6b8..b483ea1c 100644
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -14,6 +14,9 @@
 
 /************************** HEADER FILES *************************/
 
+/* Define to 1 if you have the <argp.h> header file. */
+#cmakedefine HAVE_ARGP_H 1
+
 /* Define to 1 if you have the <pty.h> header file. */
 #cmakedefine HAVE_PTY_H 1