diff --git a/archaius2-core/src/main/java/com/netflix/archaius/ConfigProxyFactory.java b/archaius2-core/src/main/java/com/netflix/archaius/ConfigProxyFactory.java
index 8e669232..652afb00 100644
--- a/archaius2-core/src/main/java/com/netflix/archaius/ConfigProxyFactory.java
+++ b/archaius2-core/src/main/java/com/netflix/archaius/ConfigProxyFactory.java
@@ -5,6 +5,7 @@
 import com.netflix.archaius.api.Property;
 import com.netflix.archaius.api.PropertyFactory;
 import com.netflix.archaius.api.PropertyRepository;
+import com.netflix.archaius.api.TypeConverter;
 import com.netflix.archaius.api.annotations.Configuration;
 import com.netflix.archaius.api.annotations.DefaultValue;
 import com.netflix.archaius.api.annotations.PropertyName;
@@ -296,9 +297,11 @@ private <T> MethodInvokerHolder buildInvokerForMethod(Class<T> type, String pref
             // This object encapsulates the way to get the value for the current property.
             final PropertyValueGetter propertyValueGetter;
 
-            if (!knownCollections.containsKey(returnType) && returnType.isInterface()) {
-                // Our return type is an interface but not a known collection. We treat it as a nested Config proxy
-                // interface and create a proxy with it, with the current property name as the initial prefix for nesting.
+            if (!knownCollections.containsKey(returnType)
+                    && returnType.isInterface()
+                    && !(decoder instanceof TypeConverter.Registry && ((TypeConverter.Registry) decoder).get(m.getGenericReturnType()).isPresent())) {
+                // Our return type is an interface but not a known collection and is also not a type our decoder can handle.
+                // We treat it as a nested Config proxy interface and create a proxy with it, with the current property name as the initial prefix for nesting.
                 propertyValueGetter = createInterfaceProperty(propName, newProxy(returnType, propName, immutable));
 
             } else if (m.getParameterCount() > 0) {
diff --git a/archaius2-core/src/main/java/com/netflix/archaius/DefaultDecoder.java b/archaius2-core/src/main/java/com/netflix/archaius/DefaultDecoder.java
index f4bbb4b0..7d020e9a 100644
--- a/archaius2-core/src/main/java/com/netflix/archaius/DefaultDecoder.java
+++ b/archaius2-core/src/main/java/com/netflix/archaius/DefaultDecoder.java
@@ -60,7 +60,12 @@ public <T> T decode(Type type, String encoded) {
             if (encoded == null) {
                 return null;
             }
-            return (T) getOrCreateConverter(type).convert(encoded);
+            @SuppressWarnings("unchecked")
+            TypeConverter<T> converter = (TypeConverter<T>) getOrCreateConverter(type);
+            if (converter == null) {
+                throw new RuntimeException("No converter found for type '" + type + "'");
+            }
+            return converter.convert(encoded);
         } catch (Exception e) {
             throw new ParseException("Error decoding type `" + type.getTypeName() + "`", e);
         }
@@ -76,7 +81,7 @@ private TypeConverter<?> getOrCreateConverter(Type type) {
         if (converter == null) {
             converter = resolve(type);
             if (converter == null) {
-                throw new RuntimeException("No converter found for type '" + type + "'");
+                return null;
             }
             TypeConverter<?> existing = cache.putIfAbsent(type, converter);
             if (existing != null) {
diff --git a/archaius2-core/src/test/java/com/netflix/archaius/DefaultDecoderTest.java b/archaius2-core/src/test/java/com/netflix/archaius/DefaultDecoderTest.java
index 7e4144a6..9c3cfe67 100644
--- a/archaius2-core/src/test/java/com/netflix/archaius/DefaultDecoderTest.java
+++ b/archaius2-core/src/test/java/com/netflix/archaius/DefaultDecoderTest.java
@@ -89,4 +89,12 @@ public void testJavaMiscellaneous() throws DecoderException {
         Assert.assertEquals(URI.create("https://netflix.com"), decoder.decode(URI.class, "https://netflix.com"));
         Assert.assertEquals(Locale.ENGLISH, decoder.decode(Locale.class, "en"));
     }
+
+    @Test
+    public void testTypeConverterRegistry() {
+        Assert.assertTrue(DefaultDecoder.INSTANCE.get(Instant.class).isPresent());
+
+        class Foo {}
+        Assert.assertFalse(DefaultDecoder.INSTANCE.get(Foo.class).isPresent());
+    }
 }
diff --git a/archaius2-core/src/test/java/com/netflix/archaius/ProxyFactoryTest.java b/archaius2-core/src/test/java/com/netflix/archaius/ProxyFactoryTest.java
index 05c833d4..92069989 100644
--- a/archaius2-core/src/test/java/com/netflix/archaius/ProxyFactoryTest.java
+++ b/archaius2-core/src/test/java/com/netflix/archaius/ProxyFactoryTest.java
@@ -4,18 +4,23 @@
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.nullValue;
 
+import java.lang.reflect.Type;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
 import java.util.SortedSet;
 import java.util.TreeSet;
 
 import javax.annotation.Nullable;
 
+import com.netflix.archaius.api.Decoder;
+import com.netflix.archaius.api.TypeConverter;
+import com.netflix.archaius.config.MapConfig;
 import org.junit.Assert;
 import org.junit.Ignore;
 import org.junit.Test;
@@ -574,4 +579,49 @@ public void testLogExcessiveUse() {
         }
         factory.newProxy(WithArguments.class, "somePrefix"); // This one should not log, because it's a new prefix.
     }
+
+    interface ConfigWithNestedInterface {
+        int intValue();
+
+        CustomObject customValue();
+
+        interface CustomObject {
+            String value();
+        }
+    }
+
+    @Test
+    public void testNestedInterfaceWithCustomDecoder() {
+        TypeConverter<ConfigWithNestedInterface.CustomObject> customObjectTypeConverter = value -> value::toUpperCase;
+
+        final class CustomDecoder implements Decoder, TypeConverter.Registry {
+            @Override
+            public <T> T decode(Class<T> type, String encoded) {
+                if (type.equals(ConfigWithNestedInterface.CustomObject.class)) {
+                    @SuppressWarnings("unchecked")
+                    T converted = (T) customObjectTypeConverter.convert(encoded);
+                    return converted;
+                }
+                return DefaultDecoder.INSTANCE.decode(type, encoded);
+            }
+
+            @Override
+            public Optional<TypeConverter<?>> get(Type type) {
+                if (type.equals(ConfigWithNestedInterface.CustomObject.class)) {
+                    return Optional.of(customObjectTypeConverter);
+                }
+                return DefaultDecoder.INSTANCE.get(type);
+            }
+        }
+        Config config = MapConfig.builder()
+                .put("intValue", "5")
+                .put("customValue", "blah")
+                .build();
+        config.setDecoder(new CustomDecoder());
+        ConfigProxyFactory proxyFactory = new ConfigProxyFactory(config, config.getDecoder(), DefaultPropertyFactory.from(config));
+
+        ConfigWithNestedInterface proxy = proxyFactory.newProxy(ConfigWithNestedInterface.class);
+        Assert.assertEquals(5, proxy.intValue());
+        Assert.assertEquals("BLAH", proxy.customValue().value());
+    }
 }