diff --git a/tests/33_fact-loop.test b/tests/33_fact-loop.test
new file mode 100644
index 0000000..78d096e
--- /dev/null
+++ b/tests/33_fact-loop.test
@@ -0,0 +1,12 @@
+int factloop (int n) {
+    int r = 1;
+    while (n > 0) {
+        r = n * r;
+        n = n - 1;
+    }
+    return r;
+}
+
+void main () {
+    puti(factloop(10));
+}