diff --git a/ci/launcher b/ci/launcher
index 25dc320..0b558fc 100755
--- a/ci/launcher
+++ b/ci/launcher
@@ -13,6 +13,8 @@ do
     $ZIG build-exe -fno-emit-bin -target $target toolchain/launcher.zig
 done
 
+$ZIG fmt --color=on --check toolchain/launcher.zig
+
 # until bazel-zig-cc gets a zig toolchain, run launcher's unit tests here.
 $ZIG test toolchain/launcher.zig