diff --git a/include/imapf.h b/include/imapf.h
new file mode 100644
index 0000000..c0a676a
--- /dev/null
+++ b/include/imapf.h
@@ -0,0 +1,28 @@
+/*
+ * ejabberd external authentication program
+ *
+ * (c) Alexander Vdolainen 2013, 2018, 2019, 2021 <alex@vapaa.xyz>
+ *
+ * this is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published
+ * by the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * this is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.";
+ *
+ */
+
+#ifndef __IMAPF_H__
+#define __IMAPF_H__
+
+#define IMAPLINE_LENGTH  320
+
+int imap_auth(struct tlsport *p, struct ejabber_msg *m);
+
+#endif /* __IMAPF_H__ */
diff --git a/src/imap.c b/src/imap.c
index 0c89145..9c352c5 100644
--- a/src/imap.c
+++ b/src/imap.c
@@ -34,8 +34,7 @@
 
 #include <eport.h>
 #include <tlsport.h>
-
-#define IMAPLINE_LENGTH  320
+#include <imapf.h>
 
 int imap_auth(struct tlsport *p, struct ejabber_msg *m)
 {