diff --git a/configure.ac b/configure.ac
index 34f0e7a1..1ecdb305 100644
--- a/configure.ac
+++ b/configure.ac
@@ -667,7 +667,6 @@ AC_SUBST([LDFLAGS])
 AC_SUBST([LIBS])
 AC_SUBST([LIBZNC])
 AC_SUBST([LIBZNCDIR])
-AC_SUBST([LIBZNC_VERSION])
 AC_SUBST([ISCYGWIN])
 AC_SUBST([MODLINK])
 AC_SUBST([NOSSL])