diff --git a/sway/commands/resize.c b/sway/commands/resize.c
index 32b746eaf..49731a641 100644
--- a/sway/commands/resize.c
+++ b/sway/commands/resize.c
@@ -457,7 +457,7 @@ static struct cmd_results *cmd_resize_set(int argc, char **argv) {
 		if (argc > num_consumed_args) {
 			return cmd_results_new(CMD_INVALID, "%s", usage);
 		}
-		if (width.unit == MOVEMENT_UNIT_INVALID) {
+		if (height.unit == MOVEMENT_UNIT_INVALID) {
 			return cmd_results_new(CMD_INVALID, "%s", usage);
 		}
 	}