diff --git a/configure.ac b/configure.ac
index 9b39a8d..58fca3d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,7 +3,7 @@ m4_define([dc_version_major],[0])
 m4_define([dc_version_minor],[2])
 m4_define([dc_version_micro],[0])
 m4_define([dc_version_suffix],[devel])
-m4_define([dc_version],dc_version_major.dc_version_minor.dc_version_micro[]m4_ifdef([dc_version_suffix],-[dc_version_suffix]))
+m4_define([dc_version],dc_version_major.dc_version_minor.dc_version_micro[]m4_ifset([dc_version_suffix],-[dc_version_suffix]))
 
 # Libtool versioning.
 m4_define([dc_version_lt_current],[0])