diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 227aeba5e..98093a7b5 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -27,7 +27,7 @@ jobs:
     - name: Install Rust
       run: |
         rustup set profile minimal
-        rustup toolchain install nightly -c rust-docs
+        rustup toolchain install nightly -c rust-docs,rustfmt
         rustup default nightly
     - name: Install mdbook
       run: |
@@ -44,7 +44,11 @@ jobs:
     - name: Run tests
       run: mdbook test
     - name: Style checks
-      run: (cd style-check && cargo run -- ../src)
+      working-directory: style-check
+      run: cargo run -- ../src
+    - name: Style fmt
+      working-directory: style-check
+      run: cargo fmt --check
     - name: Check for broken links
       run: |
         curl -sSLo linkcheck.sh \
diff --git a/style-check/src/main.rs b/style-check/src/main.rs
index 4a9ff9a69..b046cdf70 100644
--- a/style-check/src/main.rs
+++ b/style-check/src/main.rs
@@ -71,7 +71,11 @@ fn check_directory(dir: &Path, bad: &mut bool) -> Result<(), Box<dyn Error>> {
             style_error!(bad, path, "em-dash not allowed, use three dashes like ---");
         }
         if contents.contains('\u{a0}') {
-            style_error!(bad, path, "don't use 0xa0 no-break-space, use &nbsp; instead");
+            style_error!(
+                bad,
+                path,
+                "don't use 0xa0 no-break-space, use &nbsp; instead"
+            );
         }
         for line in contents.lines() {
             if line.ends_with(' ') {