1 files changed, 7 insertions, 3 deletions
diff --git a/src/x11/headless.rs b/src/x11/headless.rs
index b4a6ba0..d13d1d0 100644
--- a/src/x11/headless.rs
+++ b/src/x11/headless.rs
@@ -5,6 +5,12 @@ use libc;
 use std::{mem, ptr};
 use super::ffi;
 
+fn with_c_str<F, T>(s: &str, f: F) -> T where F: FnOnce(*const i8) -> T {
+    use std::ffi::CString;
+    let c_str = CString::from_slice(s.as_bytes());
+    f(c_str.as_slice_with_nul().as_ptr())    
+}
+
 pub struct HeadlessContext {
     context: ffi::OSMesaContext,
     buffer: Vec<u32>,
@@ -41,10 +47,8 @@ impl HeadlessContext {
     }
 
     pub fn get_proc_address(&self, addr: &str) -> *const () {
-        use std::c_str::ToCStr;
-
         unsafe {
-            addr.with_c_str(|s| {
+            with_c_str(addr, |s| {
                 ffi::OSMesaGetProcAddress(mem::transmute(s)) as *const ()
             })
         }