diff --git a/pkgs/development/libraries/libevdevplus/default.nix b/pkgs/development/libraries/libevdevplus/default.nix
index f538aab64adf..0f2b3e052665 100644
--- a/pkgs/development/libraries/libevdevplus/default.nix
+++ b/pkgs/development/libraries/libevdevplus/default.nix
@@ -2,7 +2,7 @@
 
 stdenv.mkDerivation rec {
   pname = "libevdevplus";
-  version = "2019-10-01";
+  version = "unstable-2019-10-01";
 
   src  = fetchFromGitHub {
     owner  = "YukiWorkshop";
diff --git a/pkgs/tools/X11/xcape/default.nix b/pkgs/tools/X11/xcape/default.nix
index 8b0c18c86184..d1b6f9b23b6d 100644
--- a/pkgs/tools/X11/xcape/default.nix
+++ b/pkgs/tools/X11/xcape/default.nix
@@ -3,7 +3,7 @@ libXi }:
 
 stdenv.mkDerivation rec {
   pname = "xcape";
-  version = "unstable-20180301";
+  version = "unstable-2018-03-01";
 
   src = fetchFromGitHub {
     owner = "alols";
diff --git a/pkgs/tools/misc/mcfly/default.nix b/pkgs/tools/misc/mcfly/default.nix
index db697bc9d511..4ea27ce092f7 100644
--- a/pkgs/tools/misc/mcfly/default.nix
+++ b/pkgs/tools/misc/mcfly/default.nix
@@ -2,13 +2,12 @@
 
 rustPlatform.buildRustPackage rec {
   pname = "mcfly";
-  version = "v0.3.1";
-  rev = version;
+  version = "0.3.1";
 
   src = fetchFromGitHub {
-    inherit rev;
     owner = "cantino";
     repo = "mcfly";
+    rev = "v${version}";
     sha256 = "0pmyw21zns4zn7pffji4yvbj63fx3g15cx81pk4bs6lzyz5zbdc2";
   };