diff --git a/pkgs/development/tools/haskell/ihaskell/wrapper.nix b/pkgs/development/tools/haskell/ihaskell/wrapper.nix
index 73050280f17e..0f42a5e34903 100644
--- a/pkgs/development/tools/haskell/ihaskell/wrapper.nix
+++ b/pkgs/development/tools/haskell/ihaskell/wrapper.nix
@@ -9,7 +9,7 @@ let
   ihaskellSh = writeScriptBin "ihaskell-notebook" ''
     #! ${stdenv.shell}
     export GHC_PACKAGE_PATH="$(echo ${ihaskellEnv}/lib/*/package.conf.d| tr ' ' ':'):$GHC_PACKAGE_PATH"
-    export PATH="${stdenv.lib.makeBinPath ([ ihaskellEnv jupyter ])}"
+    export PATH="${stdenv.lib.makeBinPath ([ ihaskellEnv jupyter ])}\${PATH:+':'}$PATH"
     ${ihaskellEnv}/bin/ihaskell install -l $(${ihaskellEnv}/bin/ghc --print-libdir) && ${jupyter}/bin/jupyter notebook
   '';
 in