diff --git a/glfw/src/vulkan.zig b/glfw/src/vulkan.zig
index f803adf7..f83fe3da 100644
--- a/glfw/src/vulkan.zig
+++ b/glfw/src/vulkan.zig
@@ -109,7 +109,7 @@ pub const VKProc = fn () callconv(.C) void;
 /// @pointer_lifetime The returned function pointer is valid until the library is terminated.
 ///
 /// @thread_safety This function may be called from any thread.
-pub fn getInstanceProcAddress(vk_instance: ?*opaque {}, proc_name: [*:0]const u8) callconv(.C) ?VKProc {
+pub fn getInstanceProcAddress(vk_instance: ?*anyopaque, proc_name: [*:0]const u8) callconv(.C) ?VKProc {
     internal_debug.assertInitialized();
     const proc_address = c.glfwGetInstanceProcAddress(if (vk_instance) |v| @ptrCast(c.VkInstance, v) else null, proc_name);
     getError() catch |err| @panic(@errorName(err));