diff --git a/lslopt/lslloadlib.py b/lslopt/lslloadlib.py
index ca85447..6e13be8 100644
--- a/lslopt/lslloadlib.py
+++ b/lslopt/lslloadlib.py
@@ -104,7 +104,7 @@ def LoadLibrary(builtins = None, fndata = None):
                                     % (ubuiltins, linenum, argtyp))
                             bad = True
                             break
-                        args.append(argtyp)
+                        args.append(u2str(argtyp))
                     if bad:
                         continue
                 name = match.group(2)
@@ -123,7 +123,8 @@ def LoadLibrary(builtins = None, fndata = None):
                                 u" in %s, overwriting: %s"
                                 % (linenum, ubuiltins, name))
                     fn = getattr(lslfuncs, name, None)
-                    functions[name] = {'Kind':'f', 'Type':typ, 'uns':True,
+                    styp = None if typ is None else u2str(typ)
+                    functions[name] = {'Kind':'f', 'Type':styp, 'uns':True,
                                        'ParamTypes':args, 'NeedsData':True}
                     if fn is not None:
                         functions[name]['Fn'] = fn
diff --git a/unit_tests/regression.suite/issue-21.lsl b/unit_tests/regression.suite/issue-21.lsl
new file mode 100644
index 0000000..0adb843
--- /dev/null
+++ b/unit_tests/regression.suite/issue-21.lsl
@@ -0,0 +1,8 @@
+default
+{
+    state_entry()
+    {
+        llOwnerSay(llList2Key(llGetObjectDetails("", [1]),0));
+        llOwnerSay(llChar(0xA1));
+    }
+}
diff --git a/unit_tests/regression.suite/issue-21.out b/unit_tests/regression.suite/issue-21.out
new file mode 100644
index 0000000..8cdc6b3
--- /dev/null
+++ b/unit_tests/regression.suite/issue-21.out
@@ -0,0 +1,8 @@
+default
+{
+    state_entry()
+    {
+        llOwnerSay((key)((string)llGetObjectDetails("", (list)1)));
+        llOwnerSay("¡");
+    }
+}