diff --git a/pkgs/development/lisp-modules/patches/cl-ana-fix-type-error.patch b/pkgs/development/lisp-modules/patches/cl-ana-fix-type-error.patch
new file mode 100644
index 000000000000..de31a1255931
--- /dev/null
+++ b/pkgs/development/lisp-modules/patches/cl-ana-fix-type-error.patch
@@ -0,0 +1,21 @@
+Fix type error in fixed-mem-cache for SBCL 2.6.0
+
+cache starts as nil and may be emptied by the loop, so (last cache)
+can return nil. (setf (cdr nil) ...) is undefined behavior that
+SBCL 2.6.0 now catches as a type conflict during compilation,
+causing COMPILE-FILE-ERROR.
+
+Use nconc instead, which handles the nil case correctly.
+
+Upstream issue: https://github.com/ghollisjr/cl-ana/issues/48
+
+--- a/makeres/makeres.lisp
++++ b/makeres/makeres.lisp
+@@ -936,5 +936,5 @@
+                    do (unload-target (pop cache))))
+               (load-target id)
+-              (setf (cdr (last cache))
+-                    (list id)))))))))
++              (setf cache
++                    (nconc cache (list id))))))))))
+
diff --git a/pkgs/development/lisp-modules/ql.nix b/pkgs/development/lisp-modules/ql.nix
index 39d41370ed11..624c7a04cc34 100644
--- a/pkgs/development/lisp-modules/ql.nix
+++ b/pkgs/development/lisp-modules/ql.nix
@@ -191,6 +191,9 @@ let
           "iolib/pathnames"
         ];
       });
+      cl-ana_dot_makeres = super.cl-ana_dot_makeres.overrideLispAttrs (o: {
+        patches = (o.patches or [ ]) ++ [ ./patches/cl-ana-fix-type-error.patch ];
+      });
       cl-ana_dot_hdf-cffi = super.cl-ana_dot_hdf-cffi.overrideLispAttrs (o: {
         nativeBuildInputs = [ pkgs.hdf5 ];
         nativeLibs = [ pkgs.hdf5 ];