diff --git a/Cargo.toml b/Cargo.toml
index 549745f..8d3757f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,6 +8,15 @@ license = "MIT"
 exclude = ["*.cfg", "*.yml"]
 edition = "2018"
 
+[package.metadata.patch.speech-dispatcher]
+version = "0.7.0"
+patches = [
+    "speech-dispatcher.patch"
+]
+
+[patch.crates-io]
+speech-dispatcher = { path = './target/patch/speech-dispatcher-0.7.0'}
+
 [lib]
 crate-type = ["lib", "cdylib", "staticlib"]
 
diff --git a/speech-dispatcher.patch b/speech-dispatcher.patch
new file mode 100644
index 0000000..65ebeab
--- /dev/null
+++ b/speech-dispatcher.patch
@@ -0,0 +1,22 @@
+diff --git src/lib.rs src/lib.rs
+index 26ba271..180513e 100644
+--- src/lib.rs
++++ src/lib.rs
+@@ -127,7 +127,7 @@ unsafe extern "C" fn cb(msg_id: u64, client_id: u64, state: u32) {
+     }
+ }
+ 
+-unsafe extern "C" fn cb_im(msg_id: u64, client_id: u64, state: u32, index_mark: *mut i8) {
++unsafe extern "C" fn cb_im(msg_id: u64, client_id: u64, state: u32, index_mark: *mut u8) {
+     let index_mark = CStr::from_ptr(index_mark);
+     let index_mark = index_mark.to_string_lossy().to_string();
+     let state = match state {
+@@ -325,7 +325,7 @@ impl Connection {
+         i32_to_bool(v)
+     }
+ 
+-    pub fn wchar(&self, priority: Priority, wchar: i32) -> bool {
++    pub fn wchar(&self, priority: Priority, wchar: u32) -> bool {
+         let v = unsafe { spd_wchar(self.0, priority as u32, wchar) };
+         i32_to_bool(v)
+     }