diff --git a/basis/windows/uniscribe/uniscribe.factor b/basis/windows/uniscribe/uniscribe.factor
index 1c1830fa02..9555927ab1 100755
--- a/basis/windows/uniscribe/uniscribe.factor
+++ b/basis/windows/uniscribe/uniscribe.factor
@@ -82,6 +82,7 @@ TUPLE: script-string < disposable font string metrics ssa size image ;
 : script-string-size ( script-string -- dim )
     ssa>> ScriptString_pSize
     dup win32-error=0/f
+    SIZE memory>struct
     [ cx>> ] [ cy>> ] bi 2array ;
 
 : dc-metrics ( dc -- metrics )