diff --git a/pkgs/games/blackshades/default.nix b/pkgs/games/blackshades/default.nix
index 4b874c954b0..bf58b523e76 100644
--- a/pkgs/games/blackshades/default.nix
+++ b/pkgs/games/blackshades/default.nix
@@ -4,7 +4,7 @@ stdenv.mkDerivation rec {
   name = "blackshades-svn-110";
   src = fetchsvn {
     url = svn://svn.icculus.org/blackshades/trunk;
-    rev = 110;
+    rev = "110";
     sha256 = "0kbrh1dympk8scjxr6av24qs2bffz44l8qmw2m5gyqf4g3rxf6ra";
   };
 
diff --git a/pkgs/games/blackshadeselite/default.nix b/pkgs/games/blackshadeselite/default.nix
index 2f503e02ec2..25b9321bec3 100644
--- a/pkgs/games/blackshadeselite/default.nix
+++ b/pkgs/games/blackshadeselite/default.nix
@@ -4,7 +4,7 @@ stdenv.mkDerivation rec {
   name = "blackshades-elite-svn-29";
   src = fetchsvn {
     url = svn://svn.gna.org/svn/blackshadeselite/trunk;
-    rev = 29;
+    rev = "29";
     sha256 = "1lkws5pqpgcgdlar11waikp6y41z678457n9jcik7nhn53cjjr1s";
   };
 
diff --git a/pkgs/games/privateer/default.nix b/pkgs/games/privateer/default.nix
index f6f3e600182..301249789da 100644
--- a/pkgs/games/privateer/default.nix
+++ b/pkgs/games/privateer/default.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation {
   src = fetchsvn {
     #url = "mirror://sourceforge/project/privateer/Wing%20Commander%20Privateer/Privateer%20Gemini%20Gold%201.03/PrivateerGold1.03.bz2.bin";
     url = "https://privateer.svn.sourceforge.net/svnroot/privateer/privgold/trunk/engine";
-    rev = 294;
+    rev = "294";
     sha256 = "e1759087d4565d3fc95e5c87d0f6ddf36b2cd5befec5695ec56ed5f3cd144c63";
   };
 
diff --git a/pkgs/games/vdrift/default.nix b/pkgs/games/vdrift/default.nix
index 7e43fbf2c88..6c571da561c 100644
--- a/pkgs/games/vdrift/default.nix
+++ b/pkgs/games/vdrift/default.nix
@@ -3,7 +3,7 @@
 
 , data ? fetchsvn {
     url = "svn://svn.code.sf.net/p/vdrift/code/vdrift-data";
-    rev = 1386;
+    rev = "1386";
     sha256 = "0ka6zir9hg0md5p03dl461jkvbk05ywyw233hnc3ka6shz3vazi1";
   }
 }:
diff --git a/pkgs/misc/cups/drivers/splix/default.nix b/pkgs/misc/cups/drivers/splix/default.nix
index 012b37959d8..e227de086de 100644
--- a/pkgs/misc/cups/drivers/splix/default.nix
+++ b/pkgs/misc/cups/drivers/splix/default.nix
@@ -1,7 +1,6 @@
 { stdenv, fetchsvn, fetchurl, cups, cups-filters, jbigkit, zlib }:
 
 let
-  rev = "315";
 
   color-profiles = stdenv.mkDerivation {
     name = "splix-color-profiles-20070625";
@@ -19,14 +18,15 @@ let
     '';
   };
 
-in stdenv.mkDerivation {
+in stdenv.mkDerivation rec {
   name = "splix-svn-${rev}";
+  rev = "315";
 
   src = fetchsvn {
     # We build this from svn, because splix hasn't been in released in several years
     # although the community has been adding some new printer models.
     url = "svn://svn.code.sf.net/p/splix/code/splix";
-    rev = "r${rev}";
+    inherit rev;
     sha256 = "16wbm4xnz35ca3mw2iggf5f4jaxpyna718ia190ka6y4ah932jxl";
   };
 
diff --git a/pkgs/os-specific/linux/kernel/linux-libre.nix b/pkgs/os-specific/linux/kernel/linux-libre.nix
index 2195bb7a29c..31cad258921 100644
--- a/pkgs/os-specific/linux/kernel/linux-libre.nix
+++ b/pkgs/os-specific/linux/kernel/linux-libre.nix
@@ -1,7 +1,7 @@
 { stdenv, lib, fetchsvn, linux
 , scripts ? fetchsvn {
     url = "https://www.fsfla.org/svn/fsfla/software/linux-libre/releases/tags/";
-    rev = "r15295";
+    rev = "15295";
     sha256 = "03kqbjy7w9zg6ry86h9sxa33z0rblznhba109lwmjwy0wx7yk1cs";
   }
 , ...
diff --git a/pkgs/servers/asterisk/default.nix b/pkgs/servers/asterisk/default.nix
index b2b681bcc8b..37f93c8e87e 100644
--- a/pkgs/servers/asterisk/default.nix
+++ b/pkgs/servers/asterisk/default.nix
@@ -76,7 +76,7 @@ let
 
   mp3-202 = fetchsvn {
     url = http://svn.digium.com/svn/thirdparty/mp3/trunk;
-    rev = 202;
+    rev = "202";
     sha256 = "1s9idx2miwk178sa731ig9r4fzx4gy1q8xazfqyd7q4lfd70s1cy";
   };
 
diff --git a/pkgs/tools/graphics/netpbm/default.nix b/pkgs/tools/graphics/netpbm/default.nix
index 05aa7b86636..534cefe9bf6 100644
--- a/pkgs/tools/graphics/netpbm/default.nix
+++ b/pkgs/tools/graphics/netpbm/default.nix
@@ -9,7 +9,7 @@ stdenv.mkDerivation rec {
 
   src = fetchsvn {
     url = "https://svn.code.sf.net/p/netpbm/code/advanced";
-    rev = 3264;
+    rev = "3264";
     sha256 = "17fmyjbxp1l18rma7gb0m8wd9kx2iwhqs8dd6fpalsn2cr8mf8hf";
   };