Fix the usage example in the README

Closes #712

1 files changed, 1 insertions, 1 deletions

diff --git a/README.md b/README.md
index 9ca5757..ca079cb 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ fn main() {
     unsafe { window.make_current() };
 
     unsafe {
-        gl::load_with(|symbol| window.get_proc_address(symbol));
+        gl::load_with(|symbol| window.get_proc_address(symbol) as *const _);
 
         gl::ClearColor(0.0, 1.0, 0.0, 1.0);
     }