diff --git a/tests/Makefile.am b/tests/Makefile.am
index 74ecac9..bf48191 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -8,23 +8,18 @@ TESTS = test_environment.sh \
         test_redirects.sh \
         test_simple.sh
 check_PROGRAMS = example example_exec
-example_SOURCES = example.c
-example_exec_SOURCES = example_exec.c
 
 if HAVE_ERR_H
     TESTS += test_err.sh
     check_PROGRAMS += example_err
-    example_error_SOURCES = example_err.c
 endif
 if HAVE_ERROR_H
     TESTS += test_error.sh
     check_PROGRAMS += example_error
-    example_error_SOURCES = example_error.c
 endif
 if HAVE_VFORK
     TESTS += test_vfork.sh
     check_PROGRAMS += example_vfork
-    example_vfork_SOURCES = example_vfork.c
 endif
 
 dist_check_SCRIPTS = $(TESTS) lib.sh