diff --git a/compiler/cpp/Makefile.am b/compiler/cpp/Makefile.am
index 95b78ee..5fee856 100644
--- a/compiler/cpp/Makefile.am
+++ b/compiler/cpp/Makefile.am
@@ -27,7 +27,7 @@
 
 AM_YFLAGS = -d
 LIBS =
-BUILT_SOURCES =
+BUILT_SOURCES = thrifty.cc
 
 bin_PROGRAMS = thrift