diff --git a/pkgs/build-support/fetchhg/default.nix b/pkgs/build-support/fetchhg/default.nix
index 1e5e76ec4ca0..45319bad3f68 100644
--- a/pkgs/build-support/fetchhg/default.nix
+++ b/pkgs/build-support/fetchhg/default.nix
@@ -30,16 +30,14 @@ lib.extendMkDerivation {
 
       outputHashAlgo = if finalAttrs.hash != null && finalAttrs.hash != "" then null else "sha256";
       outputHashMode = "recursive";
-      outputHash =
-        lib.throwIf (finalAttrs.hash != null && sha256 != null) "Only one of sha256 or hash can be set"
-          (
-            if finalAttrs.hash != null then
-              finalAttrs.hash
-            else if sha256 != null then
-              sha256
-            else
-              ""
-          );
+      outputHash = lib.throwIf (hash != null && sha256 != null) "Only one of sha256 or hash can be set" (
+        if finalAttrs.hash != null then
+          finalAttrs.hash
+        else if sha256 != null then
+          sha256
+        else
+          ""
+      );
 
       inherit url rev hash;
       inherit preferLocalBuild;