diff --git a/t/Makefile.am b/t/Makefile.am
index e119e9d..1a172ce 100644
--- a/t/Makefile.am
+++ b/t/Makefile.am
@@ -1,6 +1,7 @@
 AUTOMAKE_OPTIONS = nostdinc
 
 check_SCRIPTS = \
+	fun-01.hcl \
 	insta-01.hcl \
 	insta-02.hcl \
 	ret-01.hcl \
diff --git a/t/Makefile.in b/t/Makefile.in
index 53d7455..13ccfa6 100644
--- a/t/Makefile.in
+++ b/t/Makefile.in
@@ -468,6 +468,7 @@ top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
 AUTOMAKE_OPTIONS = nostdinc
 check_SCRIPTS = \
+	fun-01.hcl \
 	insta-01.hcl \
 	insta-02.hcl \
 	ret-01.hcl \
diff --git a/t/fun-01.hcl b/t/fun-01.hcl
new file mode 100644
index 0000000..53c85ce
--- /dev/null
+++ b/t/fun-01.hcl
@@ -0,0 +1,16 @@
+defun aaa(a b) {
+	| c |
+	set c (+ a b);
+	return c;
+};
+
+set k (aaa 10 20);
+
+(if (= k 30)
+	(printf "OK\n")
+else
+	(printf "ERROR\n")
+)
+
+
+