diff --git a/bin/pip-diff b/bin/pip-diff
index 337d0bb..a0d5f8b 100755
--- a/bin/pip-diff
+++ b/bin/pip-diff
@@ -13,6 +13,7 @@ Options:
 import os
 from docopt import docopt
 from pip.req import parse_requirements
+from pip.index import PackageFinder
 
 class Requirements(object):
     def __init__(self, reqfile=None):
@@ -31,7 +32,8 @@ class Requirements(object):
         if not os.path.exists(reqfile):
             raise ValueError('The given requirements file does not exist.')
 
-        for requirement in parse_requirements(reqfile):
+        finder = PackageFinder([], [])
+        for requirement in parse_requirements(reqfile, finder=finder):
             if requirement.req:
                 self.requirements.append(requirement.req)
 
@@ -109,4 +111,4 @@ def main():
 
 
 if __name__ == '__main__':
-    main()
\ No newline at end of file
+    main()
diff --git a/bin/pip-grep b/bin/pip-grep
index ab90914..9ce53e3 100755
--- a/bin/pip-grep
+++ b/bin/pip-grep
@@ -10,6 +10,8 @@ Options:
 import os
 from docopt import docopt
 from pip.req import parse_requirements
+from pip.index import PackageFinder
+
 
 class Requirements(object):
     def __init__(self, reqfile=None):
@@ -28,7 +30,8 @@ class Requirements(object):
         if not os.path.exists(reqfile):
             raise ValueError('The given requirements file does not exist.')
 
-        for requirement in parse_requirements(reqfile):
+        finder = PackageFinder([], [])
+        for requirement in parse_requirements(reqfile, finder=finder):
             self.requirements.append(requirement)
 
 
@@ -73,4 +76,4 @@ def main():
 
 
 if __name__ == '__main__':
-    main()
\ No newline at end of file
+    main()