diff --git a/compiler/cpp/Makefile.am b/compiler/cpp/Makefile.am
index f5514d9..485e30c 100644
--- a/compiler/cpp/Makefile.am
+++ b/compiler/cpp/Makefile.am
@@ -23,7 +23,7 @@
 
 AM_YFLAGS = -d
 LIBS =
-BUILT_SOURCES = thrifty.cc
+BUILT_SOURCES = src/thrifty.cc
 
 bin_PROGRAMS = thrift