diff --git a/capa/features/insn.py b/capa/features/insn.py
index 9b13b861..ca612e56 100644
--- a/capa/features/insn.py
+++ b/capa/features/insn.py
@@ -16,7 +16,7 @@ class API(Feature):
             modname, _, impname = name.rpartition(".")
             name = modname.lower() + "." + impname
 
-        super(API, self).__init__(name, description)
+        super(API, self).__init__(name, description=description)
 
 
 class Number(Feature):