diff --git a/src/Convert/Interface.hs b/src/Convert/Interface.hs
index bb82fcd..0e16c3d 100644
--- a/src/Convert/Interface.hs
+++ b/src/Convert/Interface.hs
@@ -302,12 +302,12 @@ convertDescription parts (Part attrs extern Module lifetime name ports items) =
                 collectDecl _ = return ()
 
         extractModportInfo :: Type -> Maybe (Identifier, Identifier)
-        extractModportInfo (InterfaceT "" "" []) = Just ("", "")
-        extractModportInfo (InterfaceT interfaceName modportName []) =
+        extractModportInfo (InterfaceT "" "" _) = Just ("", "")
+        extractModportInfo (InterfaceT interfaceName modportName _) =
             if isInterface interfaceName
                 then Just (interfaceName, modportName)
                 else Nothing
-        extractModportInfo (Alias interfaceName []) =
+        extractModportInfo (Alias interfaceName _) =
             if isInterface interfaceName
                 then Just (interfaceName, "")
                 else Nothing
@@ -496,15 +496,17 @@ inlineInstance global ranges modportBindings items partName
                 Variable d t x a e
             else if makeBindingBaseExpr modportE == Nothing then
                 CommentDecl $ "removed modport instance " ++ x
-            else if null a then
+            else if null modportDims then
                 localparam (modportBaseName x) bindingBaseExpr
             else
                 localparam (modportBaseName x) $
-                    BinOp Sub bindingBaseExpr (sliceLo NonIndexed $ head a)
+                    BinOp Sub bindingBaseExpr (sliceLo NonIndexed modportDim)
             where
                 maybeModportBinding = lookup x modportBindings
                 Just (_, modportE) = maybeModportBinding
                 bindingBaseExpr = Ident $ bindingBaseName ++ x
+                modportDims = a ++ snd (typeRanges t)
+                [modportDim] = modportDims
 
         removeModportInstance other = other
 
diff --git a/src/Convert/UnpackedArray.hs b/src/Convert/UnpackedArray.hs
index 2fa93b3..918a6cc 100644
--- a/src/Convert/UnpackedArray.hs
+++ b/src/Convert/UnpackedArray.hs
@@ -29,25 +29,25 @@ convert :: [AST] -> [AST]
 convert = map $ traverseDescriptions convertDescription
 
 convertDescription :: Description -> Description
-convertDescription (description @ (Part _ _ Module _ _ _ _)) =
+convertDescription (description @ (Part _ _ Module _ _ ports _)) =
     evalState (operation description) Set.empty
     where
-        operation =
-            partScoperT traverseDeclM traverseModuleItemM noop traverseStmtM >=>
+        operation = partScoperT
+            (traverseDeclM ports) traverseModuleItemM noop traverseStmtM >=>
             partScoperT rewriteDeclM noop noop noop
         noop = return
 convertDescription other = other
 
 -- tracks multi-dimensional unpacked array declarations
-traverseDeclM :: Decl -> ST Decl
-traverseDeclM (decl @ (Variable _ _ _ [] _)) = return decl
-traverseDeclM (decl @ (Variable dir _ x _ e)) = do
+traverseDeclM :: [Identifier] -> Decl -> ST Decl
+traverseDeclM _ (decl @ (Variable _ _ _ [] _)) = return decl
+traverseDeclM ports (decl @ (Variable _ _ x _ e)) = do
     insertElem x decl
-    if dir /= Local || e /= Nil
+    if elem x ports || e /= Nil
         then flatUsageM x
         else return ()
     return decl
-traverseDeclM other = return other
+traverseDeclM _ other = return other
 
 -- pack decls marked for packing
 rewriteDeclM :: Decl -> ST Decl
diff --git a/test/basic/interface_delay_2.sv b/test/basic/interface_delay_2.sv
new file mode 100644
index 0000000..faf56e0
--- /dev/null
+++ b/test/basic/interface_delay_2.sv
@@ -0,0 +1,18 @@
+interface Interface;
+    logic [0:1][0:2] arr;
+endinterface
+
+module Module(intf);
+    Interface intf [3:3][1:2];
+    assign intf[3][2].arr[1] = 1;
+    assign intf[3][2].arr[0][0] = 0;
+    initial $display("2: %b", intf[3][2].arr);
+endmodule
+
+module top;
+    Interface intf [1:1][1:2] ();
+    Module mod (intf);
+    assign intf[1][1].arr[1] = 6;
+    assign intf[1][1].arr[0][0] = 1;
+    initial $display("1: %b", intf[1][1].arr);
+endmodule
diff --git a/test/basic/interface_delay_2.v b/test/basic/interface_delay_2.v
new file mode 100644
index 0000000..28673b4
--- /dev/null
+++ b/test/basic/interface_delay_2.v
@@ -0,0 +1,14 @@
+module top;
+    if (1) begin : intf1
+        wire [0:1][0:2] arr;
+    end
+    if (1) begin : intf2
+        wire [0:1][0:2] arr;
+    end
+    assign intf2.arr[1] = 1;
+    assign intf2.arr[0][0] = 0;
+    initial $display("2: %b", intf2.arr);
+    assign intf1.arr[1] = 6;
+    assign intf1.arr[0][0] = 1;
+    initial $display("1: %b", intf1.arr);
+endmodule