diff --git a/include/sudo_compat.h b/include/sudo_compat.h
index c2c951f4c..3642a3465 100644
--- a/include/sudo_compat.h
+++ b/include/sudo_compat.h
@@ -392,7 +392,7 @@ __dso_public int sudo_getgrouplist(const char *name, gid_t basegid, gid_t *group
 # undef getgrouplist
 # define getgrouplist(_a, _b, _c, _d) sudo_getgrouplist((_a), (_b), (_c), (_d))
 #endif /* GETGROUPLIST */
-#if defined(HAVE_GETGROUPLIST_2) && !defined(HAVE_DECL_GETGROUPLIST_2)
+#if defined(HAVE_GETGROUPLIST_2) && !HAVE_DECL_GETGROUPLIST_2
 int getgrouplist_2(const char *name, gid_t basegid, gid_t **groups);
 #endif /* HAVE_GETGROUPLIST_2 && !HAVE_DECL_GETGROUPLIST_2 */
 #ifndef HAVE_GETLINE