diff --git a/compiler/cpp/Makefile.am b/compiler/cpp/Makefile.am
index fa8d1ca..b1b6b01 100644
--- a/compiler/cpp/Makefile.am
+++ b/compiler/cpp/Makefile.am
@@ -100,6 +100,9 @@
 if THRIFT_GEN_html
 thrift_SOURCES += src/generate/t_html_generator.cc
 endif
+if THRIFT_GEN_js
+thrift_SOURCES += src/generate/t_js_generator.cc
+endif
 
 thrift_CXXFLAGS = -Wall -I$(srcdir)/src $(BOOST_CPPFLAGS)
 thrift_LDFLAGS = -Wall $(BOOST_LDFLAGS)