diff --git a/tests/template/twhenintemplates.nim b/tests/template/twhenintemplates.nim
new file mode 100644
index 0000000000..6fded856de
--- /dev/null
+++ b/tests/template/twhenintemplates.nim
@@ -0,0 +1,11 @@
+# bug #3670
+
+template someTempl(someConst: bool) =
+  when someConst:
+    var a : int
+  if true:
+    when not someConst:
+      var a : int
+    a = 5
+
+someTempl(true)