diff --git a/cppadcodegen/Makefile b/cppadcodegen/Makefile
index 1185dc73235e1c552d5af6a3f185b87e16775b69..ae39e53e6a31ffb9836f5be02f181a86651297a4 100644
--- a/cppadcodegen/Makefile
+++ b/cppadcodegen/Makefile
@@ -25,6 +25,7 @@ DYNAMIC_PLIST_DIRS+=	share/doc/cppadcg
 include ../../wip/cppad/depend.mk
 include ../../wip/mk/sysdep/llvm.mk
 include ../../math/eigen3/depend.mk
+include ../../math/eigen3/googletest.mk
 include ../../mk/sysdep/doxygen.mk
 include ../../mk/sysdep/cmake.mk
 include ../../mk/language/c.mk