diff --git a/syntax/improper.rs b/syntax/improper.rs
index 6fd3162..e016884 100644
--- a/syntax/improper.rs
+++ b/syntax/improper.rs
@@ -31,6 +31,7 @@
             | Type::SliceRefU8(_) => Definite(true),
             Type::UniquePtr(_) | Type::CxxVector(_) => Definite(false),
             Type::Ref(ty) => self.determine_improper_ctype(&ty.inner),
+            Type::Array(ty) => self.determine_improper_ctype(&ty.inner),
         }
     }
 }