diff --git a/configure.ac b/configure.ac
index 74a99e32f1b5f4df971d8cb96e9cd3a5b9674f7e..1f1160858f070458f3f646eff51e884f8f21e917 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,7 +3,7 @@ dnl Process this file with autoconf to produce a configure script.
 dnl graph-tool package version number
 m4_define(graph_tool_version_major, 2)
 m4_define(graph_tool_version_minor, 2)
-m4_define(graph_tool_version_micro, 18dev)
+m4_define(graph_tool_version_micro, 18)
 
 AC_INIT([graph-tool],[graph_tool_version_major().graph_tool_version_minor().graph_tool_version_micro()],[http://graph-tool.skewed.de])