diff --git a/src/libexpr/flake/lockfile.hh b/src/libexpr/flake/lockfile.hh
index 4616a77f6..868ab89ad 100644
--- a/src/libexpr/flake/lockfile.hh
+++ b/src/libexpr/flake/lockfile.hh
@@ -67,7 +67,7 @@ struct LockFile
     std::optional<FlakeRef> isUnlocked() const;
 
     bool operator ==(const LockFile & other) const;
-    // Needed for old gcc versions that don't syntethise it (like gcc 8.2.2
+    // Needed for old gcc versions that don't synthesize it (like gcc 8.2.2
     // that is still the default on aarch64-linux)
     bool operator !=(const LockFile & other) const;