diff --git a/configure.ac b/configure.ac
index 1b94de65..cd395d91 100644
--- a/configure.ac
+++ b/configure.ac
@@ -29,8 +29,8 @@ LT_INIT([win32-dll])
 # * Otherwise, increment LT_REVISION
 
 # LT = libtool
-LT_CURRENT=19
-LT_AGE=1
+LT_CURRENT=20
+LT_AGE=2
 LT_REVISION=0
 AC_SUBST(LT_CURRENT)
 AC_SUBST(LT_REVISION)