diff --git a/bindings/python/scripts/dlite-validate b/bindings/python/scripts/dlite-validate
index 8a2635e34..48fc03827 100644
--- a/bindings/python/scripts/dlite-validate
+++ b/bindings/python/scripts/dlite-validate
@@ -5,8 +5,23 @@ import sys
 import argparse
 import json
 import re
+import ctypes
+from ctypes.util import find_library
 from pathlib import Path
 
+# Silence warning about behavior by setting environment variable
+# DLITE_BEHAVIOR=OFF before importing dlite.
+# This must be done at c-level outside os.environ.
+clib = find_library("c")
+dll = ctypes.CDLL(clib)
+setenv = dll.setenv
+setenv.argtypes = [
+    ctypes.POINTER(ctypes.c_char),  # name
+    ctypes.POINTER(ctypes.c_char),  # value
+    ctypes.c_int,                   # overwrite
+]
+setenv(b"DLITE_BEHAVIOR", b"OFF", 1)
+
 import dlite
 
 
diff --git a/src/dlite-behavior.c b/src/dlite-behavior.c
index b6f8d0c1b..c8b6a62f5 100644
--- a/src/dlite-behavior.c
+++ b/src/dlite-behavior.c
@@ -128,7 +128,7 @@ int dlite_behavior_get(const char *name)
     const char *ver = dlite_get_version();  // current version
     b->value = (strcmp_semver(ver, b->version_new) >= 0) ? 1 : 0;
 
-    dlite_warnx("Behavior `%s` is not configured. "
+    dlite_warnx("Behavior change `%s` is not configured. "
                 "It will be enabled by default from v%s. "
                 "See https://sintef.github.io/dlite/user_guide/configure_behavior_changes.html for more info.",
                 b->name, b->version_new);