diff --git a/extra/project-euler/project-euler.factor b/extra/project-euler/project-euler.factor
index 6b25f98bb3..3af3227c9e 100644
--- a/extra/project-euler/project-euler.factor
+++ b/extra/project-euler/project-euler.factor
@@ -1,46 +1,20 @@
 ! Copyright (c) 2007-2010 Aaron Schaefer, Samuel Tardieu.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: definitions io io.files io.pathnames kernel math math.parser
-    prettyprint project-euler.ave-time sequences vocabs vocabs.loader
-    project-euler.001 project-euler.002 project-euler.003 project-euler.004
-    project-euler.005 project-euler.006 project-euler.007 project-euler.008
-    project-euler.009 project-euler.010 project-euler.011 project-euler.012
-    project-euler.013 project-euler.014 project-euler.015 project-euler.016
-    project-euler.017 project-euler.018 project-euler.019 project-euler.020
-    project-euler.021 project-euler.022 project-euler.023 project-euler.024
-    project-euler.025 project-euler.026 project-euler.027 project-euler.028
-    project-euler.029 project-euler.030 project-euler.031 project-euler.032
-    project-euler.033 project-euler.034 project-euler.035 project-euler.036
-    project-euler.037 project-euler.038 project-euler.039 project-euler.040
-    project-euler.041 project-euler.042 project-euler.043 project-euler.044
-    project-euler.045 project-euler.046 project-euler.047 project-euler.048
-    project-euler.049 project-euler.050 project-euler.051 project-euler.052
-    project-euler.053 project-euler.054 project-euler.055 project-euler.056
-    project-euler.057 project-euler.058 project-euler.059 project-euler.062
-    project-euler.063 project-euler.065 project-euler.067 project-euler.069
-    project-euler.070 project-euler.071 project-euler.072 project-euler.073
-    project-euler.074 project-euler.075 project-euler.076 project-euler.079
-    project-euler.081 project-euler.085 project-euler.089 project-euler.092
-    project-euler.097 project-euler.099 project-euler.100 project-euler.102
-    project-euler.112 project-euler.116 project-euler.117 project-euler.124
-    project-euler.134 project-euler.148 project-euler.150 project-euler.151
-    project-euler.164 project-euler.169 project-euler.173 project-euler.175
-    project-euler.186 project-euler.188 project-euler.190 project-euler.203
-    project-euler.206 project-euler.215 project-euler.255 project-euler.265 ;
+USING: io kernel math.parser prettyprint sequences
+vocabs.loader ;
 IN: project-euler
 
 <PRIVATE
 
 : problem-prompt ( -- n )
     "Which problem number from Project Euler would you like to solve?"
-    print readln string>number ;
+    print flush readln string>number ;
 
 : number>euler ( n -- str )
     number>string 3 CHAR: 0 pad-head ;
 
 : solution-path ( n -- str/f )
-    number>euler "project-euler." prepend
-    lookup-vocab where dup [ first <pathname> ] when ;
+    number>euler "project-euler." prepend vocab-source-path ;
 
 PRIVATE>