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-rw-r--r--pkgs/applications/networking/mumble/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/applications/networking/mumble/default.nix b/pkgs/applications/networking/mumble/default.nix
index d93fea1f702a9..c7500d903288b 100644
--- a/pkgs/applications/networking/mumble/default.nix
+++ b/pkgs/applications/networking/mumble/default.nix
@@ -104,7 +104,7 @@ let
   server = source: generic {
     type = "murmur";
 
-    postPatch = lib.optional iceSupport ''
+    postPatch = lib.optionalString iceSupport ''
       grep -Rl '/usr/share/Ice' . | xargs sed -i 's,/usr/share/Ice/,${zeroc-ice.dev}/share/ice/,g'
     '';