diff --git a/pkgs/build-support/fetchbower/default.nix b/pkgs/build-support/fetchbower/default.nix
index dd0bac49cb6..3e1f0eff84a 100644
--- a/pkgs/build-support/fetchbower/default.nix
+++ b/pkgs/build-support/fetchbower/default.nix
@@ -4,13 +4,13 @@ let
     let
       components = lib.splitString "#" version;
       hash = lib.last components;
-      ver = if builtins.length components == 1 then version else hash;
+      ver = if builtins.length components == 1 then (cleanName version) else hash;
     in ver;
 
-  bowerName = name: lib.replaceStrings ["/"] ["-"] name;
+  cleanName = name: lib.replaceStrings ["/" ":"] ["-" "-"] name;
 
   fetchbower = name: version: target: outputHash: stdenv.mkDerivation {
-    name = "${bowerName name}-${bowerVersion version}";
+    name = "${cleanName name}-${bowerVersion version}";
     SSL_CERT_FILE = "${cacert}/etc/ssl/certs/ca-bundle.crt";
     buildCommand = ''
       fetch-bower --quiet --out=$PWD/out "${name}" "${target}" "${version}"