diff --git a/configure.ac b/configure.ac
index d41cf9a5..4c4e6d49 100644
--- a/configure.ac
+++ b/configure.ac
@@ -13,8 +13,6 @@ AM_MAINTAINER_MODE
 AM_DEP_TRACK
 
 AC_SUBST(VERSION)
-ISODATE=`date +%Y-%m-%d`
-AC_SUBST(ISODATE)
 
 SODIUM_LIBRARY_VERSION_MAJOR=10
 SODIUM_LIBRARY_VERSION_MINOR=1