diff --git a/src/V3Width.cpp b/src/V3Width.cpp
index b97837a48..3147147f1 100644
--- a/src/V3Width.cpp
+++ b/src/V3Width.cpp
@@ -3837,9 +3837,8 @@ class WidthVisitor final : public VNVisitor {
                             // instance pointer), not a static instance. Mark the
                             // dtype virtual so a method call on it dispatches per
                             // instance instead of inlining to one fixed scope.
-                            AstIfaceRefDType* const subRefp
-                                = VN_CAST(subDtypep->skipRefp(), IfaceRefDType);
-                            if (subRefp) {
+                            if (AstIfaceRefDType* const subRefp
+                                = VN_CAST(subDtypep->skipRefp(), IfaceRefDType)) {
                                 AstIfaceRefDType* const newDtypep = new AstIfaceRefDType{
                                     nodep->fileline(), subRefp->cellName(), subRefp->ifaceName()};
                                 newDtypep->ifacep(subRefp->ifacep());
diff --git a/test_regress/t/t_interface_virtual_sub_iface_method.v b/test_regress/t/t_interface_virtual_sub_iface_method.v
index 709e99c9f..6cf486f5b 100644
--- a/test_regress/t/t_interface_virtual_sub_iface_method.v
+++ b/test_regress/t/t_interface_virtual_sub_iface_method.v
@@ -62,6 +62,9 @@ module t;
     `checkd(oif.m.sub.cnt, 8'd1)
     `checkd(drv.read_a(), 8'd1)
     `checkd(oif.d.val, 8'd99)
+    // Direct (non-virtual) sub-interface method call: covers the non-virtual dtype path.
+    oif.a.bump();
+    `checkd(oif.a.cnt, 8'd2)
     $write("*-* All Finished *-*\n");
     $finish;
   end