diff --git a/tests/Makefile b/tests/Makefile
index 861487a..74c1a32 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -23,7 +23,7 @@
 
 all: $(APPS)
 
-%.c : suites/%.function suites/%.data scripts/generate_code.pl
+%.c : suites/%.function suites/%.data scripts/generate_code.pl suites/helpers.function
 	echo   "  Generate	$@"
 	scripts/generate_code.pl suites $*