diff --git a/pkgs/development/lisp-modules/clwrapper/cl-wrapper.sh b/pkgs/development/lisp-modules/clwrapper/cl-wrapper.sh
index 522d2c252684..65fb6e615f5f 100755
--- a/pkgs/development/lisp-modules/clwrapper/cl-wrapper.sh
+++ b/pkgs/development/lisp-modules/clwrapper/cl-wrapper.sh
@@ -13,7 +13,7 @@ shift
 export NIX_LISP NIX_LISP_LOAD_FILE NIX_LISP_EXEC_CODE NIX_LISP_COMMAND NIX_LISP_FINAL_PARAMETERS
 
 test -n "$NIX_LISP_LD_LIBRARY_PATH" &&
-	export LD_LIBRARY_PATH="$LD_LIBRARY_PATH${LD_LIBRARY_PATH+:}$NIX_LISP_LD_LIBRARY_PATH"
+	export LD_LIBRARY_PATH="$LD_LIBRARY_PATH${LD_LIBRARY_PATH:+:}$NIX_LISP_LD_LIBRARY_PATH"
 
 declare -a NIX_LISP_FINAL_PARAMETERS;
 
diff --git a/pkgs/development/lisp-modules/define-package.nix b/pkgs/development/lisp-modules/define-package.nix
index b13ddf8357f4..390e0e061128 100644
--- a/pkgs/development/lisp-modules/define-package.nix
+++ b/pkgs/development/lisp-modules/define-package.nix
@@ -33,7 +33,7 @@ let
     test -n "$LD_LIBRARY_PATH" &&
         echo "export LD_LIBRARY_PATH=\"\$LD_LIBRARY_PATH\''${LD_LIBRARY_PATH:+:}\"'$LD_LIBRARY_PATH'" >> "$path_config_script"
     test -n "$NIX_LISP_LD_LIBRARY_PATH" &&
-        echo "export NIX_LISP_LD_LIBRARY_PATH=\"\$NIX_LISP_LD_LIBRARY_PATH\''${NIX_LISP_LD_LIBRARY_PATH:+:}\"'$(echo "$NIX_LISP_LD_LIBRARY_PATH" | tr -d '\n' | tr : '\n' | sort | uniq | tr '\n' ':')'" >> "$path_config_script"
+        echo "export NIX_LISP_LD_LIBRARY_PATH=\"\$NIX_LISP_LD_LIBRARY_PATH\''${NIX_LISP_LD_LIBRARY_PATH:+:}\"'$(echo "$NIX_LISP_LD_LIBRARY_PATH" | tr -d '\n' | tr : '\n' | sort | uniq | tr '\n' ':' | sed -e 's/:$//')'" >> "$path_config_script"
     echo "fi" >> "$path_config_script"
   '';
   deployLaunchScript = ''
@@ -43,7 +43,7 @@ let
     chmod a+x "$launch_script"
     echo "#! /bin/sh" >> "$launch_script"
     echo "source '$config_script'" >> "$launch_script"
-    echo "export LD_LIBRARY_PATH=\"\$NIX_LISP_LD_LIBRARY_PATH\''${NIX_LISP_LD_LIBRARY_PATH:+:}\$LD_LIBRARY_PATH\"" >> "$launch_script"
+    echo "test -n \"\$NIX_LISP_LD_LIBRARY_PATH\" export LD_LIBRARY_PATH=\"\$NIX_LISP_LD_LIBRARY_PATH\''${LD_LIBRARY_PATH:+:}\$LD_LIBRARY_PATH\"" >> "$launch_script"
     echo '"${clwrapper}/bin/common-lisp.sh" "$@"' >> "$launch_script"
   '';
   moveAsdFiles = ''