diff --git a/protobuf/Makefile b/protobuf/Makefile
index 509f3c33c..983629e13 100644
--- a/protobuf/Makefile
+++ b/protobuf/Makefile
@@ -62,6 +62,7 @@ proto-obj-y	+= siginfo.o
 proto-obj-y	+= rpc.o
 proto-obj-y	+= ext-file.o
 proto-obj-y	+= cgroup.o
+proto-obj-y	+= userns.o
 
 proto		:= $(proto-obj-y:.o=)
 proto-c		:= $(proto-obj-y:.o=.pb-c.c)
diff --git a/protobuf/userns.proto b/protobuf/userns.proto
new file mode 100644
index 000000000..942854961
--- /dev/null
+++ b/protobuf/userns.proto
@@ -0,0 +1,10 @@
+message uid_gid_extent {
+	required uint32 first		= 1;
+	required uint32 lower_first	= 2;
+	required uint32 count		= 3;
+}
+
+message userns_entry {
+	repeated uid_gid_extent uid_map	= 1;
+	repeated uid_gid_extent gid_map = 2;
+}