diff --git a/configure.ac b/configure.ac
index 5c3820d9..85d91036 100644
--- a/configure.ac
+++ b/configure.ac
@@ -149,7 +149,7 @@ AC_MSG_NOTICE([extra cflags for scanner.c: $CFLAGS_SCANNER_EXTRA])
 AC_SUBST(CFLAGS_SCANNER_EXTRA)
 
 
-LIBPOSTAL_SO_VERSION="${LIBPOSTAL_MAJOR_VERSION}:${LIBPOSTAL_MINOR_VERSION}:${LIBPOSTAL_PATCH_VERSION}"
+LIBPOSTAL_SO_VERSION="${LIBPOSTAL_MAJOR_VERSION}:${LIBPOSTAL_MINOR_VERSION}:0"
 AC_SUBST(LIBPOSTAL_SO_VERSION)
 
 AC_OUTPUT