diff --git a/extra/javascriptcore/ffi/ffi.factor b/extra/javascriptcore/ffi/ffi.factor
index 6489699d4d..7a038b0883 100644
--- a/extra/javascriptcore/ffi/ffi.factor
+++ b/extra/javascriptcore/ffi/ffi.factor
@@ -2,16 +2,18 @@
 ! See http://factorcode.org/license.txt for BSD license.
 USING: alien alien.c-types alien.libraries alien.syntax
 classes.struct combinators io.encodings.utf16n
-io.encodings.utf8 system ;
+io.encodings.utf8 kernel system ;
 IN: javascriptcore.ffi
 
 <<
 "javascriptcore" {
-        { [ os macosx? ] [ "/System/Library/Frameworks/JavaScriptCore.framework/Versions/Current/JavaScriptCore" ] }
-        ! { [ os winnt? ]  [ "javascriptcore.dll" ] }
-        ! { [ os unix? ]  [ "libsqlite3.so" ] }
-        [ ]
-    } cond cdecl add-library
+    { [ os macosx? ] [
+        "/System/Library/Frameworks/JavaScriptCore.framework/Versions/Current/JavaScriptCore" cdecl add-library
+    ] }
+    ! { [ os winnt? ]  [ "javascriptcore.dll" ] }
+    ! { [ os unix? ]  [ "libsqlite3.so" ] }
+    [ drop ]
+} cond
 >>
 
 LIBRARY: javascriptcore
diff --git a/extra/javascriptcore/javascriptcore-tests.factor b/extra/javascriptcore/javascriptcore-tests.factor
index f04ada89f2..53ae12d2b0 100644
--- a/extra/javascriptcore/javascriptcore-tests.factor
+++ b/extra/javascriptcore/javascriptcore-tests.factor
@@ -3,8 +3,8 @@
 USING: accessors javascriptcore kernel tools.test ;
 IN: javascriptcore.tests
 
-[ "2" ] [ "1+1" eval-js ] unit-test
+[ "2" ] [ "1+1" eval-js-standalone ] unit-test
 
-[ "1+shoes" eval-js ]
+[ "1+shoes" eval-js-standalone ]
 [ error>> "ReferenceError: Can't find variable: shoes" = ] must-fail-with
 
diff --git a/extra/javascriptcore/javascriptcore.factor b/extra/javascriptcore/javascriptcore.factor
index eabb97df61..65b6fe5fff 100644
--- a/extra/javascriptcore/javascriptcore.factor
+++ b/extra/javascriptcore/javascriptcore.factor
@@ -35,14 +35,13 @@ SYMBOL: js-context
         drop f
     ] if* ;
 
-: eval-js ( string -- result-string )
-    '[
-        [
-            dup _ JSStringCreateWithUTF8CString f f 0 JSValueRef <c-object>
-            [ JSEvaluateScript ] keep *void*
-            dup [ nip JSValueRef>string javascriptcore-error ] [ drop JSValueRef>string ] if
-        ] with-global-context
-    ] with-javascriptcore ;
+: eval-js ( context string -- result-string )
+    dupd JSStringCreateWithUTF8CString f f 0 JSValueRef <c-object>
+    [ JSEvaluateScript ] keep *void*
+    dup [ nip JSValueRef>string javascriptcore-error ] [ drop JSValueRef>string ] if ;
 
-: eval-js-path ( path -- result-string ) utf8 file-contents eval-js ;
+: eval-js-standalone ( string -- result-string )
+    '[ [ _ eval-js ] with-global-context ] with-javascriptcore ;
+
+: eval-js-path-standalone ( path -- result-string ) utf8 file-contents eval-js-standalone ;