diff --git a/include/render/vulkan.h b/include/render/vulkan.h
index c0ba9b20..2794f340 100644
--- a/include/render/vulkan.h
+++ b/include/render/vulkan.h
@@ -125,7 +125,7 @@ struct wlr_vk_format_props {
 void vulkan_format_props_query(struct wlr_vk_device *dev,
 	const struct wlr_vk_format *format);
 const struct wlr_vk_format_modifier_props *vulkan_format_props_find_modifier(
-	struct wlr_vk_format_props *props, uint64_t mod, bool render);
+	const struct wlr_vk_format_props *props, uint64_t mod, bool render);
 void vulkan_format_props_finish(struct wlr_vk_format_props *props);
 
 struct wlr_vk_pipeline_layout_key {
diff --git a/render/vulkan/pixel_format.c b/render/vulkan/pixel_format.c
index 3dd9c4d3..0568c023 100644
--- a/render/vulkan/pixel_format.c
+++ b/render/vulkan/pixel_format.c
@@ -569,7 +569,7 @@ void vulkan_format_props_finish(struct wlr_vk_format_props *props) {
 }
 
 const struct wlr_vk_format_modifier_props *vulkan_format_props_find_modifier(
-		struct wlr_vk_format_props *props, uint64_t mod, bool render) {
+		const struct wlr_vk_format_props *props, uint64_t mod, bool render) {
 	uint32_t len;
 	const struct wlr_vk_format_modifier_props *mods;
 	if (render) {