diff --git a/nix/overlay.nix b/nix/overlay.nix
index e87b19298..0cf5c6fd1 100644
--- a/nix/overlay.nix
+++ b/nix/overlay.nix
@@ -1,36 +1,39 @@
 # An overlay allows for a package set to be extended with new or modified packages
 
 # `final` refers to the package set with all overlays applied.
 # This allows for added or modified packages to be referenced with
 # all relevant changes
 final:
 
 # `prev` refers to the previous package set before this current overlay is applied.
 # This is cheaper for nix to evaluate, thus should be prefered over final when possible.
 prev:
 
 {
   # add packages meant for just this repository
   amqp-cpp = prev.callPackage ./amqp-cpp.nix { };
 
   protobuf_3_15_cmake = prev.callPackage ./protobuf_3_15.nix { };
 
   devShell = final.callPackage ./dev-shell.nix { };
 
   mysql-down = prev.callPackage ./mysql-down-linux.nix { };
 
   mysql-up = prev.callPackage ./mysql-up-linux.nix { };
 
   arcanist = prev.arcanist.override(_: {
     # php8.1 will cause warnings to throw as exceptions
     # around calling strlen() with null
     php = prev.php80;
   });
 
   olm = prev.olm.overrideAttrs(oldAttrs: {
-    # *.hh files aren't meant to be used externally, so we patch installation to add it
+    # *.hh files aren't meant to be used externally
+    # so we patch installation to add it
     postInstall = ''
-      cp $NIX_BUILD_TOP/${oldAttrs.src.name}/include/olm/*.h* ''${!outputDev}/include/olm
+      cp \
+        $NIX_BUILD_TOP/${oldAttrs.src.name}/include/olm/*.h* \
+        ''${!outputDev}/include/olm
     '';
   });
 }