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Diffstat (limited to 'pkgs/applications/audio/zynaddsubfx/default.nix')
-rw-r--r--pkgs/applications/audio/zynaddsubfx/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/applications/audio/zynaddsubfx/default.nix b/pkgs/applications/audio/zynaddsubfx/default.nix
index 986e3215b93fc..4b3cbb171bd0e 100644
--- a/pkgs/applications/audio/zynaddsubfx/default.nix
+++ b/pkgs/applications/audio/zynaddsubfx/default.nix
@@ -91,7 +91,7 @@ in stdenv.mkDerivation rec {
 
   # When building with zest GUI, patch plugins
   # and standalone executable to properly locate zest
-  postFixup = lib.optional (guiModule == "zest") ''
+  postFixup = lib.optionalString (guiModule == "zest") ''
     patchelf --set-rpath "${mruby-zest}:$(patchelf --print-rpath "$out/lib/lv2/ZynAddSubFX.lv2/ZynAddSubFX_ui.so")" \
       "$out/lib/lv2/ZynAddSubFX.lv2/ZynAddSubFX_ui.so"