diff --git a/Sources/StructuredFieldValues/Encoder/StructuredFieldValueEncoder.swift b/Sources/StructuredFieldValues/Encoder/StructuredFieldValueEncoder.swift
index ac8530f..f5aeabc 100644
--- a/Sources/StructuredFieldValues/Encoder/StructuredFieldValueEncoder.swift
+++ b/Sources/StructuredFieldValues/Encoder/StructuredFieldValueEncoder.swift
@@ -209,7 +209,11 @@ extension _StructuredFieldEncoder: Encoder {
     }
 
     func unkeyedContainer() -> UnkeyedEncodingContainer {
-        StructuredFieldUnkeyedEncodingContainer(encoder: self)
+        if case .itemOrInnerList(let params) = self.currentStackEntry.storage {
+            // This is an inner list, even if nothing is ever appended to it.
+            self.currentStackEntry.storage = .innerList(InnerList(bareInnerList: [], parameters: params))
+        }
+        return StructuredFieldUnkeyedEncodingContainer(encoder: self)
     }
 
     func singleValueContainer() -> SingleValueEncodingContainer {
diff --git a/Tests/StructuredFieldValuesTests/StructuredFieldEncoderTests.swift b/Tests/StructuredFieldValuesTests/StructuredFieldEncoderTests.swift
index a6ce1b8..4e17ce3 100644
--- a/Tests/StructuredFieldValuesTests/StructuredFieldEncoderTests.swift
+++ b/Tests/StructuredFieldValuesTests/StructuredFieldEncoderTests.swift
@@ -310,6 +310,17 @@ final class StructuredFieldEncoderTests: XCTestCase {
         XCTAssertEqual(Array("(1 2 3), (4 5 6)".utf8), try encoder.encode(List(header)))
     }
 
+    func testEmptyInnerListsBare() throws {
+        struct DictionaryField: StructuredFieldValue {
+            static let structuredFieldType: StructuredFieldType = .dictionary
+            var x: [Int]
+        }
+
+        let encoder = StructuredFieldValueEncoder()
+        XCTAssertEqual(Array("(), (1 2 3), ()".utf8), try encoder.encode(List([[], [1, 2, 3], []])))
+        XCTAssertEqual(Array("x=()".utf8), try encoder.encode(DictionaryField(x: [])))
+    }
+
     func testListFieldInnerListsParameters() throws {
         struct Integers: Equatable, Codable {
             var items: [Int]