diff --git a/src/api.rs b/src/api.rs
index f737243e7..19779995e 100644
--- a/src/api.rs
+++ b/src/api.rs
@@ -1,8 +1,10 @@
+use std::ffi::c_char;
+
 use crate::plugins::PLUGIN_REGISTRAR;
 
 // API provided by RustDesk.
-pub type LoadPluginFunc = fn(*const i8) -> i32;
-pub type UnloadPluginFunc = fn(*const i8) -> i32;
+pub type LoadPluginFunc = fn(*const c_char) -> i32;
+pub type UnloadPluginFunc = fn(*const c_char) -> i32;
 
 #[repr(C)]
 pub struct RustDeskApiTable {
@@ -11,12 +13,12 @@ pub struct RustDeskApiTable {
 }
 
 #[no_mangle]
-fn load_plugin(path: *const i8) -> i32 {
+fn load_plugin(path: *const c_char) -> i32 {
     PLUGIN_REGISTRAR.load_plugin(path)
 }
 
 #[no_mangle]
-fn unload_plugin(path: *const i8) -> i32 {
+fn unload_plugin(path: *const c_char) -> i32 {
     PLUGIN_REGISTRAR.unload_plugin(path)
 }
 
diff --git a/src/plugins.rs b/src/plugins.rs
index 7356380d3..4e44a2643 100644
--- a/src/plugins.rs
+++ b/src/plugins.rs
@@ -75,7 +75,7 @@ pub struct PluginRegistar<P: Plugin> {
 }
 
 impl<P: Plugin> PluginRegistar<P> {
-    pub fn load_plugin(&self, path: *const i8) -> i32 {
+    pub fn load_plugin(&self, path: *const c_char) -> i32 {
         let p = unsafe { CStr::from_ptr(path) };
         let lib_path = p.to_str().unwrap_or("").to_owned();
         let lib = unsafe { libloading::Library::new(lib_path.as_str()) };
@@ -100,7 +100,7 @@ impl<P: Plugin> PluginRegistar<P> {
         -1
     }
 
-    pub fn unload_plugin(&self, path: *const i8) -> i32 {
+    pub fn unload_plugin(&self, path: *const c_char) -> i32 {
         let p = unsafe { CStr::from_ptr(path) };
         let lib_path = p.to_str().unwrap_or("").to_owned();
         match PLUGIN_REGISTRAR.plugins.write().unwrap().remove(&lib_path) {