diff --git a/render/pixel_format.c b/render/pixel_format.c
index e6417fd7..586d2a09 100644
--- a/render/pixel_format.c
+++ b/render/pixel_format.c
@@ -66,7 +66,7 @@ static const struct wlr_pixel_format_info pixel_format_info[] = {
 		.drm_format = DRM_FORMAT_RGBA4444,
 		.opaque_substitute = DRM_FORMAT_RGBX4444,
 		.bpp = 16,
-		.has_alpha = false,
+		.has_alpha = true,
 	},
 	{
 		.drm_format = DRM_FORMAT_RGBX5551,
@@ -78,7 +78,7 @@ static const struct wlr_pixel_format_info pixel_format_info[] = {
 		.drm_format = DRM_FORMAT_RGBA5551,
 		.opaque_substitute = DRM_FORMAT_RGBX5551,
 		.bpp = 16,
-		.has_alpha = false,
+		.has_alpha = true,
 	},
 	{
 		.drm_format = DRM_FORMAT_RGB565,