diff --git a/pkgs/build-support/release/source-tarball.nix b/pkgs/build-support/release/source-tarball.nix
index 5e178544644..c7129ae83f9 100644
--- a/pkgs/build-support/release/source-tarball.nix
+++ b/pkgs/build-support/release/source-tarball.nix
@@ -123,7 +123,7 @@ stdenv.mkDerivation (
 
       # Tarball builds are generally important, so give them a high
       # default priority.
-      schedulingPriority = "200";
+      schedulingPriority = 200;
     };
   }
 
diff --git a/pkgs/stdenv/generic/check-meta.nix b/pkgs/stdenv/generic/check-meta.nix
index cd20c4a3cef..6ae6e646e98 100644
--- a/pkgs/stdenv/generic/check-meta.nix
+++ b/pkgs/stdenv/generic/check-meta.nix
@@ -162,7 +162,7 @@ let
     position = str;
     repositories = attrsOf str;
     isBuildPythonPackage = platforms;
-    schedulingPriority = str;
+    schedulingPriority = int;
     downloadURLRegexp = str;
     isFcitxEngine = bool;
     isIbusEngine = bool;