diff --git a/pkgs/by-name/ko/koboldcpp/package.nix b/pkgs/by-name/ko/koboldcpp/package.nix
index 51400a89e76b..7d49b8dd4588 100644
--- a/pkgs/by-name/ko/koboldcpp/package.nix
+++ b/pkgs/by-name/ko/koboldcpp/package.nix
@@ -40,7 +40,7 @@ let
   makeBool = option: bool: (if bool then "${option}=1" else "");
 
   libraryPathWrapperArgs = lib.optionalString config.cudaSupport ''
-    --prefix LD_LIBRARY_PATH: "${lib.makeLibraryPath [ addDriverRunpath.driverLink ]}"
+    --prefix LD_LIBRARY_PATH : "${lib.makeLibraryPath [ addDriverRunpath.driverLink ]}"
   '';
 
   darwinFrameworks =
@@ -158,7 +158,7 @@ effectiveStdenv.mkDerivation (finalAttrs: {
   postFixup = ''
     wrapPythonProgramsIn "$out/bin" "$pythonPath"
     makeWrapper "$out/bin/koboldcpp.unwrapped" "$out/bin/koboldcpp" \
-      --prefix PATH ${lib.makeBinPath [ tk ]} ${libraryPathWrapperArgs}
+      --prefix PATH : ${lib.makeBinPath [ tk ]} ${libraryPathWrapperArgs}
   '';
 
   passthru.updateScript = gitUpdater { rev-prefix = "v"; };