diff --git a/extra/math/erato/erato-tests.factor b/extra/math/erato/erato-tests.factor
index 1f59659fa9..041cb8dc3a 100644
--- a/extra/math/erato/erato-tests.factor
+++ b/extra/math/erato/erato-tests.factor
@@ -1,6 +1,6 @@
 ! Copyright (c) 2007 Samuel Tardieu.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: lists lists.lazy math.erato tools.test ;
+USING: lists.lazy math.erato tools.test ;
 IN: math.erato.tests
 
 [ { 2 3 5 7 11 13 17 19 } ] [ 20 lerato list>array ] unit-test
diff --git a/extra/math/erato/erato.factor b/extra/math/erato/erato.factor
index 292cec8def..b9d997c038 100644
--- a/extra/math/erato/erato.factor
+++ b/extra/math/erato/erato.factor
@@ -1,6 +1,6 @@
 ! Copyright (c) 2007 Samuel Tardieu.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: bit-arrays kernel lists lists.lazy math math.functions math.primes.list
+USING: bit-arrays kernel lists.lazy math math.functions math.primes.list
        math.ranges sequences ;
 IN: math.erato
 
diff --git a/extra/math/primes/primes-tests.factor b/extra/math/primes/primes-tests.factor
index 2db98af893..186acc9b11 100644
--- a/extra/math/primes/primes-tests.factor
+++ b/extra/math/primes/primes-tests.factor
@@ -1,4 +1,4 @@
-USING: arrays math.primes tools.test lists lists.lazy ;
+USING: arrays math.primes tools.test lists.lazy ;
 
 { 1237 } [ 1234 next-prime ] unit-test
 { f t } [ 1234 prime? 1237 prime? ] unit-test
diff --git a/extra/math/primes/primes.factor b/extra/math/primes/primes.factor
index e42bb8d82d..59aebbf0dd 100644
--- a/extra/math/primes/primes.factor
+++ b/extra/math/primes/primes.factor
@@ -1,6 +1,6 @@
 ! Copyright (C) 2007 Samuel Tardieu.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: combinators kernel lists lists.lazy math math.functions math.miller-rabin
+USING: combinators kernel lists.lazy math math.functions math.miller-rabin
        math.order math.primes.list math.ranges sequences sorting ;
 IN: math.primes
 
diff --git a/extra/parser-combinators/parser-combinators-tests.factor b/extra/parser-combinators/parser-combinators-tests.factor
index 062277ec4d..70698daa0b 100755
--- a/extra/parser-combinators/parser-combinators-tests.factor
+++ b/extra/parser-combinators/parser-combinators-tests.factor
@@ -1,6 +1,6 @@
 ! Copyright (C) 2005 Chris Double.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: kernel lists lists.lazy tools.test strings math
+USING: kernel lists.lazy tools.test strings math
 sequences parser-combinators arrays math.parser unicode.categories ;
 IN: parser-combinators.tests
 
diff --git a/extra/parser-combinators/simple/simple.factor b/extra/parser-combinators/simple/simple.factor
index 5182260e98..f7a696ca35 100755
--- a/extra/parser-combinators/simple/simple.factor
+++ b/extra/parser-combinators/simple/simple.factor
@@ -1,6 +1,6 @@
 ! Copyright (C) 2006 Chris Double.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: kernel strings math sequences lists lists.lazy words
+USING: kernel strings math sequences lists.lazy words
 math.parser promises parser-combinators unicode.categories ;
 IN: parser-combinators.simple
 
diff --git a/extra/project-euler/007/007.factor b/extra/project-euler/007/007.factor
index 10e95bd2b5..40178c4291 100644
--- a/extra/project-euler/007/007.factor
+++ b/extra/project-euler/007/007.factor
@@ -1,6 +1,6 @@
 ! Copyright (c) 2007 Aaron Schaefer.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: lists lists.lazy math math.primes ;
+USING: lists.lazy math math.primes ;
 IN: project-euler.007
 
 ! http://projecteuler.net/index.php?section=problems&id=7