diff --git a/sys/kern/kern_environment.c b/sys/kern/kern_environment.c
index 73551f4b00d6..ce8e778feb66 100644
--- a/sys/kern/kern_environment.c
+++ b/sys/kern/kern_environment.c
@@ -310,6 +310,7 @@ getenv(const char *name)
 	int len;
 
 	if (dynamic_kenv) {
+		WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "getenv");
 		mtx_lock(&kenv_lock);
 		cp = _getenv_dynamic(name, NULL);
 		if (cp != NULL) {