diff --git a/src/mio.py b/src/mio.py
index 243477f82f9118eedb2afd7b9d57a3c21d0aa3f8..a0c1a287a6fd4df1ca7136ead56aa330dbf985a0 100755
--- a/src/mio.py
+++ b/src/mio.py
@@ -6,6 +6,7 @@ import mio.transform
 import mio.parser
 import mio.repository
 import optparse
+import os
 import os.path
 import re
 import sys
@@ -116,6 +117,9 @@ if __name__ == '__main__':
     rules = mio.repository.Repository(find_and_parse)
 
     rpm_result = None
+
+    if options.prefix:
+        os.environ["MIO_PREFIX"] = options.prefix
     
     if options.list:
         # List all targets reachable from the given source files