diff --git a/basis/specialized-arrays/alien/alien.factor b/basis/specialized-arrays/alien/alien.factor
index a2bca17a9a..465d1665f9 100644
--- a/basis/specialized-arrays/alien/alien.factor
+++ b/basis/specialized-arrays/alien/alien.factor
@@ -1,5 +1,4 @@
 USE: specialized-arrays.functor
 IN: specialized-arrays.alien
 
-<< "void*" define-array >>
-<< "ptrdiff_t" define-array >>
+<< "void*" define-array >>
\ No newline at end of file
diff --git a/basis/specialized-arrays/ptrdiff_t/ptrdiff_t.factor b/basis/specialized-arrays/ptrdiff_t/ptrdiff_t.factor
new file mode 100644
index 0000000000..4fd7d825cc
--- /dev/null
+++ b/basis/specialized-arrays/ptrdiff_t/ptrdiff_t.factor
@@ -0,0 +1,4 @@
+USE: specialized-arrays.functor
+IN: specialized-arrays.alien
+
+<< "ptrdiff_t" define-array >>