diff --git a/tests/Makefile.am b/tests/Makefile.am
index d3e9667..d15c8a7 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -24,11 +24,13 @@ check_PROGRAMS = $(PSL_TESTS)
 TESTS_ENVIRONMENT = TESTS_VALGRIND="@VALGRIND_ENVIRONMENT@"
 TESTS = $(PSL_TESTS)
 
-# dafsa.psl must be created before any test is executed
+# dafsa.psl and dafsa_ascii.psl must be created before any test is executed
 # check-local target works in parallel to the tests, so the test suite will likely fail
-BUILT_SOURCES = dafsa.psl
-dafsa.psl:
+BUILT_SOURCES = psl.dafsa psl_ascii.dafsa
+psl.dafsa:
 	$(top_srcdir)/src/psl-make-dafsa --input-format=psl --output-format=binary "$(PSL_FILE)" psl.dafsa
+psl_ascii.dafsa:
+	$(top_srcdir)/src/psl-make-dafsa --input-format=psl --output-format=binary --encoding=ascii "$(PSL_FILE)" psl_ascii.dafsa
 
 clean-local:
-	rm -f psl.dafsa
\ No newline at end of file
+	rm -f psl.dafsa psl_ascii.dafsa