diff --git a/pkgs/development/interpreters/xulrunner/wrapper/default.nix b/pkgs/development/interpreters/xulrunner/wrapper/default.nix
index e6d3b20ef9df..5d0ccccc674c 100644
--- a/pkgs/development/interpreters/xulrunner/wrapper/default.nix
+++ b/pkgs/development/interpreters/xulrunner/wrapper/default.nix
@@ -5,7 +5,7 @@ stdenv.mkDerivation {
 
   builder = ./builder.sh;
   inherit xulrunner launcher;
-  appfile = application + /application.ini;
+  appfile = application + "/application.ini";
 
   inherit (application) meta;
 }
diff --git a/pkgs/development/tools/misc/help2man/default.nix b/pkgs/development/tools/misc/help2man/default.nix
index d9463bbe75e3..19b9848309da 100644
--- a/pkgs/development/tools/misc/help2man/default.nix
+++ b/pkgs/development/tools/misc/help2man/default.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation {
   ];
 
   # So that configure can find `preloadable_libintl.so'.
-  LD_LIBRARY_PATH = gettext + /lib;
+  LD_LIBRARY_PATH = gettext + "/lib";
 
   inherit gettext;
 }
diff --git a/pkgs/development/tools/misc/help2man/help2man-1.36.4.nix b/pkgs/development/tools/misc/help2man/help2man-1.36.4.nix
index 6b113ad68bdd..7705265667bc 100644
--- a/pkgs/development/tools/misc/help2man/help2man-1.36.4.nix
+++ b/pkgs/development/tools/misc/help2man/help2man-1.36.4.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation {
   ];
 
   # So that configure can find `preloadable_libintl.so'.
-  LD_LIBRARY_PATH = gettext + /lib;
+  LD_LIBRARY_PATH = gettext + "/lib";
 
   inherit gettext;
 }
diff --git a/pkgs/games/zoom/default.nix b/pkgs/games/zoom/default.nix
index 129f431de8e1..71b4241582dc 100644
--- a/pkgs/games/zoom/default.nix
+++ b/pkgs/games/zoom/default.nix
@@ -10,5 +10,5 @@ stdenv.mkDerivation {
   };
   buildInputs = [perl expat xlibs freetype];
   # Zoom doesn't add the right directory in the include path.
-  CFLAGS = ["-I" (freetype + /include/freetype2)];
+  CFLAGS = ["-I" (freetype + "/include/freetype2")];
 }
diff --git a/pkgs/misc/tex/nix/default.nix b/pkgs/misc/tex/nix/default.nix
index 83b299ac82d2..81dfd8babc83 100644
--- a/pkgs/misc/tex/nix/default.nix
+++ b/pkgs/misc/tex/nix/default.nix
@@ -32,7 +32,7 @@ rec {
     pkgs.stdenv.mkDerivation {
       name = "latex-includes";
 
-      realBuilder = pkgs.perl + /bin/perl;
+      realBuilder = pkgs.perl + "/bin/perl";
       args = [ ./find-includes.pl ];
 
       rootFile = toString rootFile; # !!! hacky
diff --git a/pkgs/stdenv/linux/default.nix b/pkgs/stdenv/linux/default.nix
index 55fb20534069..4eb5862186b0 100644
--- a/pkgs/stdenv/linux/default.nix
+++ b/pkgs/stdenv/linux/default.nix
@@ -214,10 +214,10 @@ rec {
       inherit (stdenvLinuxBoot2Pkgs) binutils;
       glibc = stdenvLinuxGlibc;
       gcc = stdenvLinuxBoot2Pkgs.gcc.gcc;
-      shell = stdenvLinuxBoot3Pkgs.bash + /bin/sh;
+      shell = stdenvLinuxBoot3Pkgs.bash + "/bin/sh";
     };
 
-    shell = stdenvLinuxBoot3Pkgs.bash + /bin/sh;
+    shell = stdenvLinuxBoot3Pkgs.bash + "/bin/sh";
     
     extraAttrs = {
       curl = stdenvLinuxBoot3Pkgs.realCurl;
diff --git a/pkgs/stdenv/mingw/default.nix b/pkgs/stdenv/mingw/default.nix
index ae06ef133b44..66fc5064e490 100644
--- a/pkgs/stdenv/mingw/default.nix
+++ b/pkgs/stdenv/mingw/default.nix
@@ -25,7 +25,7 @@ let {
       inherit system;
       name = "stdenv-init2-mingw";
       shell = msysShell;
-      path = [(msys + /bin)];
+      path = [(msys + "/bin")];
     };
 
   /**
@@ -37,12 +37,12 @@ let {
       name = "stdenv-init3-mingw";
       shell = msysShell;
       path = [
-        (make + /bin)
-        (binutils + /bin)
-        (gccCore + /bin)
-        (mingwRuntimeBin + /bin)
-        (w32apiBin + /bin)
-        (msys + /bin)
+        (make + "/bin")
+        (binutils + "/bin")
+        (gccCore + "/bin")
+        (mingwRuntimeBin + "/bin")
+        (w32apiBin + "/bin")
+        (msys + "/bin")
       ];
 
       extraEnv = {
@@ -65,7 +65,7 @@ let {
         };
 
       shell =
-        msys + /bin/sh + ".exe";
+        msys + "/bin/sh.exe";
 
       stdenv =
         stdenvInit2.mkDerivation {
@@ -158,7 +158,7 @@ let {
     };
 
   msysShell = 
-    msys + /bin/sh + ".exe";
+    msys + "/bin/sh.exe";
 
   /**
    * Binary packages, based on stdenvInit2
diff --git a/pkgs/stdenv/nix/default.nix b/pkgs/stdenv/nix/default.nix
index 401ce2417b8f..0c9b0c8027a9 100644
--- a/pkgs/stdenv/nix/default.nix
+++ b/pkgs/stdenv/nix/default.nix
@@ -17,10 +17,10 @@ import ../generic {
       else
         pkgs.binutils;
     gcc = if stdenv.isDarwin then pkgs.gccApple.gcc else pkgs.gcc.gcc;
-    shell = pkgs.bash + /bin/sh;
+    shell = pkgs.bash + "/bin/sh";
   };
 
-  shell = pkgs.bash + /bin/sh;
+  shell = pkgs.bash + "/bin/sh";
 
   extraAttrs = {
     curl = pkgs.realCurl;