diff --git a/alloc.c b/alloc.c
index 4fe49ff..8b2745e 100644
--- a/alloc.c
+++ b/alloc.c
@@ -420,7 +420,7 @@ check_alloc_valid(struct liftoff_output *output, struct alloc_result *result,
 static bool
 check_plane_output_compatible(struct liftoff_plane *plane, struct liftoff_output *output)
 {
-	return (plane->possible_crtcs & (1 << output->crtc_index)) != 0;
+	return (plane->possible_crtcs & (1UL << output->crtc_index)) != 0;
 }
 
 static int
diff --git a/example/common.c b/example/common.c
index 0613217..5725c7f 100644
--- a/example/common.c
+++ b/example/common.c
@@ -51,7 +51,7 @@ pick_crtc(int drm_fd, drmModeRes *drm_res, drmModeConnector *connector)
 
 			for (j = 0; !found && j < drm_res->count_crtcs; j++) {
 				/* Can the CRTC drive the connector? */
-				if (enc->possible_crtcs & (1 << j)) {
+				if (enc->possible_crtcs & (1UL << j)) {
 					crtc_id = drm_res->crtcs[j];
 					found = true;
 				}