diff --git a/test/Makefile.am b/test/Makefile.am
index ff56179..0ded744 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -6,7 +6,8 @@
 
 utest_LDADD = $(top_builddir)/libocc_control.la -lstdc++fs
 
-utest_SOURCES = utest.cpp \
+utest_SOURCES = error_files_tests.cpp \
+                utest.cpp \
                 TestI2cOcc.cpp
 
 utest_CPPFLAGS = $(GTEST_CPPFLAGS) \