diff --git a/cli/src/tests/highlight_test.rs b/cli/src/tests/highlight_test.rs
index 6b09d64c..e0b356d2 100644
--- a/cli/src/tests/highlight_test.rs
+++ b/cli/src/tests/highlight_test.rs
@@ -1,6 +1,7 @@
 use super::helpers::fixtures::{get_highlight_config, get_language, get_language_queries_path};
 use lazy_static::lazy_static;
 use std::ffi::CString;
+use std::os::raw::c_char;
 use std::sync::atomic::{AtomicUsize, Ordering};
 use std::{fs, ptr, slice, str};
 use tree_sitter_highlight::{
@@ -489,15 +490,15 @@ fn test_highlighting_via_c_api() {
     ];
     let highlight_names = highlights
         .iter()
-        .map(|h| h["class=".len()..].as_ptr() as *const i8)
+        .map(|h| h["class=".len()..].as_ptr() as *const c_char)
         .collect::<Vec<_>>();
     let highlight_attrs = highlights
         .iter()
-        .map(|h| h.as_bytes().as_ptr() as *const i8)
+        .map(|h| h.as_bytes().as_ptr() as *const c_char)
         .collect::<Vec<_>>();
     let highlighter = c::ts_highlighter_new(
-        &highlight_names[0] as *const *const i8,
-        &highlight_attrs[0] as *const *const i8,
+        &highlight_names[0] as *const *const c_char,
+        &highlight_attrs[0] as *const *const c_char,
         highlights.len() as u32,
     );
 
@@ -515,9 +516,9 @@ fn test_highlighting_via_c_api() {
         js_scope.as_ptr(),
         js_injection_regex.as_ptr(),
         language,
-        highlights_query.as_ptr() as *const i8,
-        injections_query.as_ptr() as *const i8,
-        locals_query.as_ptr() as *const i8,
+        highlights_query.as_ptr() as *const c_char,
+        injections_query.as_ptr() as *const c_char,
+        locals_query.as_ptr() as *const c_char,
         highlights_query.len() as u32,
         injections_query.len() as u32,
         locals_query.len() as u32,
@@ -534,8 +535,8 @@ fn test_highlighting_via_c_api() {
         html_scope.as_ptr(),
         html_injection_regex.as_ptr(),
         language,
-        highlights_query.as_ptr() as *const i8,
-        injections_query.as_ptr() as *const i8,
+        highlights_query.as_ptr() as *const c_char,
+        injections_query.as_ptr() as *const c_char,
         ptr::null(),
         highlights_query.len() as u32,
         injections_query.len() as u32,
diff --git a/lib/binding_rust/lib.rs b/lib/binding_rust/lib.rs
index e88a411c..1df9e7ac 100644
--- a/lib/binding_rust/lib.rs
+++ b/lib/binding_rust/lib.rs
@@ -705,14 +705,14 @@ impl Tree {
     /// after calling one of the [Parser::parse] functions. Call it on the old tree that
     /// was passed to parse, and pass the new tree that was returned from `parse`.
     pub fn changed_ranges(&self, other: &Tree) -> impl ExactSizeIterator<Item = Range> {
-        let mut count = 0;
+        let mut count = 0u32;
         unsafe {
             let ptr = ffi::ts_tree_get_changed_ranges(
                 self.0.as_ptr(),
                 other.0.as_ptr(),
-                &mut count as *mut _ as *mut u32,
+                &mut count as *mut u32,
             );
-            util::CBufferIter::new(ptr, count).map(|r| r.into())
+            util::CBufferIter::new(ptr, count as usize).map(|r| r.into())
         }
     }
 }
diff --git a/tags/src/c_lib.rs b/tags/src/c_lib.rs
index 8f689a9a..088cc7bc 100644
--- a/tags/src/c_lib.rs
+++ b/tags/src/c_lib.rs
@@ -215,9 +215,9 @@ pub extern "C" fn ts_tags_buffer_tags_len(this: *const TSTagsBuffer) -> u32 {
 }
 
 #[no_mangle]
-pub extern "C" fn ts_tags_buffer_docs(this: *const TSTagsBuffer) -> *const i8 {
+pub extern "C" fn ts_tags_buffer_docs(this: *const TSTagsBuffer) -> *const c_char {
     let buffer = unwrap_ptr(this);
-    buffer.docs.as_ptr() as *const i8
+    buffer.docs.as_ptr() as *const c_char
 }
 
 #[no_mangle]
@@ -237,7 +237,7 @@ pub extern "C" fn ts_tagger_syntax_kinds_for_scope_name(
     this: *mut TSTagger,
     scope_name: *const c_char,
     len: *mut u32,
-) -> *const *const i8 {
+) -> *const *const c_char {
     let tagger = unwrap_mut_ptr(this);
     let scope_name = unsafe { unwrap(CStr::from_ptr(scope_name).to_str()) };
     let len = unwrap_mut_ptr(len);
@@ -245,7 +245,7 @@ pub extern "C" fn ts_tagger_syntax_kinds_for_scope_name(
     *len = 0;
     if let Some(config) = tagger.languages.get(scope_name) {
         *len = config.c_syntax_type_names.len() as u32;
-        return config.c_syntax_type_names.as_ptr() as *const *const i8;
+        return config.c_syntax_type_names.as_ptr() as *const *const c_char;
     }
     std::ptr::null()
 }