diff --git a/compiler/cpp/Makefile.am b/compiler/cpp/Makefile.am
index 1678c26..884a935 100644
--- a/compiler/cpp/Makefile.am
+++ b/compiler/cpp/Makefile.am
@@ -11,8 +11,9 @@
                  src/generate/t_cpp_generator.cc \
                  src/generate/t_java_generator.cc \
                  src/generate/t_php_generator.cc \
-                 src/generate/t_xsd_generator.cc \
-                 src/generate/t_py_generator.cc
+                 src/generate/t_py_generator.cc \
+                 src/generate/t_rb_generator.cc \
+                 src/generate/t_xsd_generator.cc
 
 thrift_CXXFLAGS = -Wall -Isrc
 thrift_LDFLAGS = -Wall