diff --git a/eden/fs/config/eden_config.thrift b/eden/fs/config/eden_config.thrift
index c244945a33..0be962423d 100644
--- a/eden/fs/config/eden_config.thrift
+++ b/eden/fs/config/eden_config.thrift
@@ -8,6 +8,7 @@
 namespace cpp2 facebook.eden
 namespace java com.facebook.eden.thrift
 namespace py facebook.eden.eden_config
+namespace py3 eden.fs.config
 
 /**
  * ConfigSource identifies the point of origin of a config setting.
diff --git a/eden/fs/service/eden.thrift b/eden/fs/service/eden.thrift
index fdde0b112c..28b36b2421 100644
--- a/eden/fs/service/eden.thrift
+++ b/eden/fs/service/eden.thrift
@@ -11,6 +11,7 @@ include "fb303/thrift/fb303_core.thrift"
 namespace cpp2 facebook.eden
 namespace java com.facebook.eden.thrift
 namespace py facebook.eden
+namespace py3 eden.fs.service
 
 /** Thrift doesn't really do unsigned numbers, but we can sort of fake it.
  * This type is serialized as an integer value that is 64-bits wide and
diff --git a/eden/fs/service/streamingeden.thrift b/eden/fs/service/streamingeden.thrift
index 826c433f41..3024383ebb 100644
--- a/eden/fs/service/streamingeden.thrift
+++ b/eden/fs/service/streamingeden.thrift
@@ -7,6 +7,7 @@
 
 include "eden/fs/service/eden.thrift"
 namespace cpp2 facebook.eden
+namespace py3 eden.fs.service
 
 /** This file holds definitions for the streaming flavor of the Eden interface
  * This is only available to cpp2 clients and won't compile for other