diff --git a/harper-ls/src/pos_conv.rs b/harper-ls/src/pos_conv.rs
index 256356c7..ad00a53f 100644
--- a/harper-ls/src/pos_conv.rs
+++ b/harper-ls/src/pos_conv.rs
@@ -31,7 +31,7 @@ fn index_to_position(source: &[char], index: usize) -> Position {
 
     Position {
         line: lines as u32,
-        character: cols as u32,
+        character: cols as u32
     }
 }
 
@@ -79,7 +79,7 @@ mod tests {
 
         let start = Position {
             line: 0,
-            character: 4,
+            character: 4
         };
 
         let i = position_to_index(&source, start);
@@ -99,7 +99,7 @@ mod tests {
 
         let a = Position {
             line: 1,
-            character: 2,
+            character: 2
         };
 
         let b = position_to_index(&source, a);
diff --git a/precommit.sh b/precommit.sh
index a648aed6..9cf5f2f1 100755
--- a/precommit.sh
+++ b/precommit.sh
@@ -7,7 +7,7 @@ set -eo pipefail
 R=$(pwd)
 RUSTDOCFLAGS="-D warnings"
 
-cargo +nightly fmt
+cargo +nightly fmt --check
 cargo clippy -- -Dwarnings
 cargo test
 cargo test --release
@@ -23,5 +23,5 @@ cd $R/web
 yarn install
 yarn run format
 yarn run lint
-yarn run check
+yarn run check --check
 yarn run build