diff --git a/src/gallium/frontends/rusticl/mesa/pipe/screen.rs b/src/gallium/frontends/rusticl/mesa/pipe/screen.rs
index 27ed706317a..118d9069635 100644
--- a/src/gallium/frontends/rusticl/mesa/pipe/screen.rs
+++ b/src/gallium/frontends/rusticl/mesa/pipe/screen.rs
@@ -11,7 +11,7 @@ use mesa_rust_util::string::*;
 use std::convert::TryInto;
 use std::ffi::CStr;
 use std::mem::size_of;
-use std::os::raw::c_char;
+use std::os::raw::c_schar;
 use std::os::raw::c_uchar;
 use std::os::raw::c_void;
 use std::ptr;
@@ -267,7 +267,7 @@ impl PipeScreen {
         unsafe { *self.ldev.ldev }.type_
     }
 
-    pub fn driver_uuid(&self) -> Option<[c_char; UUID_SIZE]> {
+    pub fn driver_uuid(&self) -> Option<[c_schar; UUID_SIZE]> {
         let mut uuid = [0; UUID_SIZE];
         let ptr = uuid.as_mut_ptr();
         unsafe {