diff --git a/src/libstore/build/local-derivation-goal.cc b/src/libstore/build/local-derivation-goal.cc
index 047c5c8ea..595149f0a 100644
--- a/src/libstore/build/local-derivation-goal.cc
+++ b/src/libstore/build/local-derivation-goal.cc
@@ -861,17 +861,17 @@ void LocalDerivationGoal::startBuilder()
                         if (settings.sandboxFallback)
                             _exit(1);
                         if (!userNamespacesEnabled && errno==EPERM)
-                            warn("user namespaces appear to be disabled; they are required for sandboxing; check /proc/sys/user/max_user_namespaces");
+                            notice("user namespaces appear to be disabled; they are required for sandboxing; check /proc/sys/user/max_user_namespaces");
                         if (userNamespacesEnabled) {
                             Path procSysKernelUnprivilegedUsernsClone = "/proc/sys/kernel/unprivileged_userns_clone";
                             if (pathExists(procSysKernelUnprivilegedUsernsClone)
                                 && trim(readFile(procSysKernelUnprivilegedUsernsClone)) == "0") {
-                                warn("user namespaces appear to be disabled; they are required for sandboxing; check /proc/sys/kernel/unprivileged_userns_clone");
+                                notice("user namespaces appear to be disabled; they are required for sandboxing; check /proc/sys/kernel/unprivileged_userns_clone");
                             }
                         }
                         Path procSelfNsUser = "/proc/self/ns/user";
                         if (!pathExists(procSelfNsUser))
-                            warn("/proc/self/ns/user does not exist; your kernel was likely built without CONFIG_USER_NS=y, which is required for sandboxing");
+                            notice("/proc/self/ns/user does not exist; your kernel was likely built without CONFIG_USER_NS=y, which is required for sandboxing");
                         /* Mention sandbox-fallback in the error message so the user
                            knows that having it disabled contributed to the
                            unrecoverability of this failure */