diff --git a/serde_derive/src/de.rs b/serde_derive/src/de.rs
index 5d403613..20ccb696 100644
--- a/serde_derive/src/de.rs
+++ b/serde_derive/src/de.rs
@@ -1386,21 +1386,26 @@ fn deserialize_identifier(
         "field identifier"
     };
 
-    let variant_indices = 0u32..;
-    let fallthrough_msg = format!("variant index 0 <= i < {}", fields.len());
-    let visit_index = quote! {
-        fn visit_u32<__E>(self, __value: u32) -> _serde::export::Result<Self::Value, __E>
-            where __E: _serde::de::Error
-        {
-            match __value {
-                #(
-                    #variant_indices => _serde::export::Ok(#constructors),
-                )*
-                _ => _serde::export::Err(_serde::de::Error::invalid_value(
-                            _serde::de::Unexpected::Unsigned(__value as u64),
-                            &#fallthrough_msg))
+    let visit_index = if is_variant {
+        let variant_indices = 0u32..;
+        let fallthrough_msg = format!("variant index 0 <= i < {}", fields.len());
+        let visit_index = quote! {
+            fn visit_u32<__E>(self, __value: u32) -> _serde::export::Result<Self::Value, __E>
+                where __E: _serde::de::Error
+            {
+                match __value {
+                    #(
+                        #variant_indices => _serde::export::Ok(#constructors),
+                    )*
+                    _ => _serde::export::Err(_serde::de::Error::invalid_value(
+                                _serde::de::Unexpected::Unsigned(__value as u64),
+                                &#fallthrough_msg))
+                }
             }
-        }
+        };
+        Some(visit_index)
+    } else {
+        None
     };
 
     let bytes_to_str = if fallthrough.is_some() {
diff --git a/test_suite/tests/test_de.rs b/test_suite/tests/test_de.rs
index c0a889af..d1bddfaf 100644
--- a/test_suite/tests/test_de.rs
+++ b/test_suite/tests/test_de.rs
@@ -605,17 +605,6 @@ declare_tests! {
             Token::StructEnd,
         ],
     }
-    test_struct_integer_keys {
-        Struct { a: 1, b: 2, c: 0 } => &[
-            Token::Struct { name: "Struct", len: 2 },
-                Token::U32(0),
-                Token::I32(1),
-
-                Token::U32(1),
-                Token::I32(2),
-            Token::StructEnd,
-        ],
-    }
     test_enum_unit {
         Enum::Unit => &[
             Token::UnitVariant { name: "Enum", variant: "Unit" },