diff --git a/pkgs/development/lisp-modules/clwrapper/cl-wrapper.sh b/pkgs/development/lisp-modules/clwrapper/cl-wrapper.sh
index fa914f6d26bc..a1cfae0e6069 100755
--- a/pkgs/development/lisp-modules/clwrapper/cl-wrapper.sh
+++ b/pkgs/development/lisp-modules/clwrapper/cl-wrapper.sh
@@ -101,7 +101,7 @@ nix_lisp_build_system(){
                                 :separator \":\")
                        for l in sb-alien::*shared-objects*
                        for ns := (sb-alien::shared-object-namestring l)
-                       do (and (> (length ns) 0) (not (equal (elt ns 0) "/"))
+                       do (and (> (length ns) 0) (not (equal (elt ns 0) \"/\"))
                                (let*
                                  ((prefix (find-if (lambda (s) (probe-file (format nil \"~a/~a\" s ns))) libpath))
                                   (fullpath (and prefix (format nil \"~a/~a\" prefix ns))))