diff --git a/configure.ac b/configure.ac
index f4d192866..5492f6bf0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -117,7 +117,7 @@ LT_INIT([shared static])
 #  --> Set 'LT_NGSPICE_AGE' to 0.
 
 LT_NGSPICE_CURRENT=0
-LT_NGSPICE_REVISION=5
+LT_NGSPICE_REVISION=6
 LT_NGSPICE_AGE=1
 LIBNGSPICE_SO_VERSION=$LT_NGSPICE_CURRENT.$LT_NGSPICE_REVISION.$LT_NGSPICE_AGE