diff --git a/arch/um/drivers/vector_kern.c b/arch/um/drivers/vector_kern.c
index bb83a2d22ac22a25b0c1718d5d20aa32734a40f8..063c76b3a21527935d5ce0ca9a1da74cb5e71b61 100644
--- a/arch/um/drivers/vector_kern.c
+++ b/arch/um/drivers/vector_kern.c
@@ -723,7 +723,7 @@ static int vector_config(char *str, char **error_out)
 	 */
 
 	params = kstrdup(params, GFP_KERNEL);
-	if (str == NULL) {
+	if (params == NULL) {
 		*error_out = "vector_config failed to strdup string";
 		return -ENOMEM;
 	}