diff --git a/lib/systems.nix b/lib/systems.nix
index 1ef869fb012..afa2002c6e4 100644
--- a/lib/systems.nix
+++ b/lib/systems.nix
@@ -22,7 +22,7 @@ rec {
   };
 
 
-  isCpuType = x: typeOf x == "cpu-type"
+  isCpuType = x: isType "cpu-type" x
     && elem x.bits [8 16 32 64 128]
     && (builtins.lessThan 8 x.bits -> isSignificantByte x.significantByte);
 
@@ -69,7 +69,7 @@ rec {
   };
 
 
-  isSystem = x: typeOf x == "system"
+  isSystem = x: isType "system" x
     && isCpuType x.cpu
     && isArchitecture x.arch
     && isKernel x.kernel;
diff --git a/lib/types.nix b/lib/types.nix
index 0545cd6a3c2..aa8a371d953 100644
--- a/lib/types.nix
+++ b/lib/types.nix
@@ -12,7 +12,6 @@ with lib.modules;
 rec {
 
   isType = type: x: (x._type or "") == type;
-  hasType = x: isAttrs x && x ? _type;
   typeOf = x: x._type or "";
 
   setType = typeName: value: value // {