diff --git a/pyconfig.h.in b/pyconfig.h.in
index 3574f67..b3a3e17 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -329,6 +329,9 @@
 /* Define this if you have flockfile(), getc_unlocked(), and funlockfile() */
 #undef HAVE_GETC_UNLOCKED
 
+/* Define to 1 if you have the `getentropy' function. */
+#undef HAVE_GETENTROPY
+
 /* Define to 1 if you have the `getgrouplist' function. */
 #undef HAVE_GETGROUPLIST