diff --git a/extra/math/miller-rabin/miller-rabin.factor b/extra/math/miller-rabin/miller-rabin.factor
old mode 100644
new mode 100755
index e2d012ec0a..8b0d98283c
--- a/extra/math/miller-rabin/miller-rabin.factor
+++ b/extra/math/miller-rabin/miller-rabin.factor
@@ -1,5 +1,6 @@
 USING: combinators combinators.lib io locals kernel math
-math.functions math.ranges namespaces random sequences ;
+math.functions math.ranges namespaces random sequences
+hashtables ;
 IN: math.miller-rabin
 
 SYMBOL: a