diff --git a/src/main/java/com/esaulpaugh/headlong/abi/TupleType.java b/src/main/java/com/esaulpaugh/headlong/abi/TupleType.java
index 206b2f2f..8a7b6117 100644
--- a/src/main/java/com/esaulpaugh/headlong/abi/TupleType.java
+++ b/src/main/java/com/esaulpaugh/headlong/abi/TupleType.java
@@ -124,7 +124,7 @@ private static int measureObject(ABIType<Object> type, Object value) {
     @Override
     public int byteLengthPacked(Tuple value) {
         final Object[] elements = value != null ? value.elements : new Object[size()];
-        return countBytes(i -> this.<ABIType<Object>>get(i).byteLengthPacked(elements[i]));
+        return countBytes(i -> this.<ABIType<? super Object>>get(i).byteLengthPacked(elements[i]));
     }
 
     private int countBytes(IntUnaryOperator counter) {
@@ -177,7 +177,7 @@ void encodeTail(Tuple value, ByteBuffer dest) {
             encodeDynamic(value.elements, dest);
         } else {
             for (int i = 0; i < value.elements.length; i++) {
-                this.<ABIType<Object>>get(i).encodeTail(value.elements[i], dest);
+                this.<ABIType<? super Object>>get(i).encodeTail(value.elements[i], dest);
             }
         }
     }
@@ -185,7 +185,7 @@ void encodeTail(Tuple value, ByteBuffer dest) {
     @Override
     void encodePackedUnchecked(Tuple value, ByteBuffer dest) {
         for (int i = 0; i < value.elements.length; i++) {
-            this.<ABIType<Object>>get(i).encodePackedUnchecked(value.elements[i], dest);
+            this.<ABIType<? super Object>>get(i).encodePackedUnchecked(value.elements[i], dest);
         }
     }
 
diff --git a/src/test/java/com/esaulpaugh/headlong/abi/DecodeTest.java b/src/test/java/com/esaulpaugh/headlong/abi/DecodeTest.java
index 06333888..9c40469a 100644
--- a/src/test/java/com/esaulpaugh/headlong/abi/DecodeTest.java
+++ b/src/test/java/com/esaulpaugh/headlong/abi/DecodeTest.java
@@ -730,7 +730,7 @@ public void testDecodeIndexedDynamicType() throws Throwable {
         byte[][] topics = {
                 FastHex.decode("d78fe195906f002940f4b32985f1daa40764f8481c05447b6751db32e70d744b"),
                 FastHex.decode("392791df626408017a264f53fde61065d5a93a32b60171df9d8a46afdf82992d"),
-                TypeFactory.<IntType>create("int8").encode(12).array()
+                TypeFactory.<ABIType<? super Integer>>create("int8").encode(12).array()
         };
         Tuple result = event.decodeArgs(topics, Strings.EMPTY_BYTE_ARRAY);
         assertEquals("392791df626408017a264f53fde61065d5a93a32b60171df9d8a46afdf82992d", Strings.encode((byte[]) result.get(0)));