diff --git a/if/regen.sh b/if/regen.sh
index ed25cc6..02e9fa2 100755
--- a/if/regen.sh
+++ b/if/regen.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 cd "`dirname $0`"
-../compiler/cpp/thrift -cpp -py reflection_limited.thrift
+../compiler/cpp/thrift --gen cpp --gen py reflection_limited.thrift
 cp gen-cpp/reflection_limited_types.h   ../lib/cpp/src/
 cp gen-cpp/reflection_limited_types.cpp ../lib/cpp/src/
 cp -r gen-py/thrift/reflection ../lib/py/src