diff --git a/src/changelog/unreleased.md b/src/changelog/unreleased.md
index 6f2a1f63..a0ac5e70 100644
--- a/src/changelog/unreleased.md
+++ b/src/changelog/unreleased.md
@@ -50,3 +50,7 @@ changelog entry.
 - Remove `EventLoop::run`.
 - Remove `EventLoopExtRunOnDemand::run_on_demand`.
 - Remove `EventLoopExtPumpEvents::pump_events`.
+
+### Fixed
+
+- On X11, build on arm platforms.
diff --git a/src/platform_impl/linux/x11/ime/context.rs b/src/platform_impl/linux/x11/ime/context.rs
index aa046af6..89a241cc 100644
--- a/src/platform_impl/linux/x11/ime/context.rs
+++ b/src/platform_impl/linux/x11/ime/context.rs
@@ -158,7 +158,7 @@ struct PreeditCallbacks {
 impl PreeditCallbacks {
     pub fn new(client_data: ffi::XPointer) -> PreeditCallbacks {
         let start_callback = create_xim_callback(client_data, unsafe {
-            mem::transmute::<usize, unsafe extern "C" fn(ffi::XIM, *mut i8, *mut i8)>(
+            mem::transmute::<usize, unsafe extern "C" fn(ffi::XIM, ffi::XPointer, ffi::XPointer)>(
                 preedit_start_callback as usize,
             )
         });