diff --git a/pkgs/overlays/unstable-from-source.nix b/pkgs/overlays/unstable-from-source.nix
index 128da58..afb8f2e 100644
--- a/pkgs/overlays/unstable-from-source.nix
+++ b/pkgs/overlays/unstable-from-source.nix
@@ -6,10 +6,14 @@ self: super:
 
 let
   useUnstable = self.config.useUnstable or true;
+  sanitizePlatform = platformConfig: self.lib.removeAttrs platformConfig [
+    "emulator"
+    "emulatorAvailable"
+  ];
 
   unstablePkgsForNixpkgs = nixpkgs: import unstableSource {
     # localSystem -> pkgs.stdenv.buildPlatform
-    localSystem = nixpkgs.stdenv.buildPlatform;
+    localSystem = sanitizePlatform nixpkgs.stdenv.buildPlatform;
     # crossSystem -> pkgs.stdenv.hostPlatform or pkgs.stdenv.targetPlatform ??
     # passing below
     # config -> pkgs.config
@@ -22,7 +26,7 @@ let
   } // (if nixpkgs.stdenv.buildPlatform == nixpkgs.stdenv.hostPlatform then {} else {
     # workaround for some odd structured packages that changes behaviour
     # when crossSystem is passed.
-    crossSystem = nixpkgs.stdenv.hostPlatform;
+    crossSystem = sanitizePlatform nixpkgs.stdenv.hostPlatform;
   });
 in
 {