diff --git a/kernel/params.c b/kernel/params.c
index cf1b691..84a1466 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -59,6 +59,8 @@ static int parse_one(char *param,
 	/* Find parameter */
 	for (i = 0; i < num_params; i++) {
 		if (parameq(param, params[i].name)) {
+			if ((!params[i].flags & KPARAM_ISBOOL) && !val)
+				return -EINVAL;
 			DEBUGP("They are equal!  Calling %p\n",
 			       params[i].set);
 			return params[i].set(val, &params[i]);