diff --git a/core/src/main/java/io/grpc/internal/ManagedChannelImplBuilder.java b/core/src/main/java/io/grpc/internal/ManagedChannelImplBuilder.java
index 128c929ec0e..dc3ea39317c 100644
--- a/core/src/main/java/io/grpc/internal/ManagedChannelImplBuilder.java
+++ b/core/src/main/java/io/grpc/internal/ManagedChannelImplBuilder.java
@@ -582,8 +582,8 @@ public ManagedChannelImplBuilder defaultServiceConfig(@Nullable Map<String, ?> s
         parsedMap.put(key, checkListEntryTypes((List<?>) value));
       } else if (value instanceof String) {
         parsedMap.put(key, value);
-      } else if (value instanceof Double) {
-        parsedMap.put(key, value);
+      } else if (value instanceof Number) {
+        parsedMap.put(key, ((Number) value).doubleValue());
       } else if (value instanceof Boolean) {
         parsedMap.put(key, value);
       } else {
@@ -606,8 +606,8 @@ private static List<?> checkListEntryTypes(List<?> list) {
         parsedList.add(checkListEntryTypes((List<?>) value));
       } else if (value instanceof String) {
         parsedList.add(value);
-      } else if (value instanceof Double) {
-        parsedList.add(value);
+      } else if (value instanceof Number) {
+        parsedList.add(((Number) value).doubleValue());
       } else if (value instanceof Boolean) {
         parsedList.add(value);
       } else {
diff --git a/core/src/test/java/io/grpc/internal/ManagedChannelImplBuilderTest.java b/core/src/test/java/io/grpc/internal/ManagedChannelImplBuilderTest.java
index b0939239477..011fcb316c7 100644
--- a/core/src/test/java/io/grpc/internal/ManagedChannelImplBuilderTest.java
+++ b/core/src/test/java/io/grpc/internal/ManagedChannelImplBuilderTest.java
@@ -735,9 +735,31 @@ public void defaultServiceConfig_intKey() {
   @Test
   public void defaultServiceConfig_intValue() {
     Map<String, Object> config = new HashMap<>();
+
     config.put("key", 3);
 
-    assertThrows(IllegalArgumentException.class, () -> builder.defaultServiceConfig(config));
+    builder.defaultServiceConfig(config);
+
+    assertThat(builder.defaultServiceConfig).containsEntry("key", 3D);
+  }
+
+  @Test
+  public void defaultServiceConfig_nestedIntValue() {
+    Map<String, Object> config = new HashMap<>();
+    List<Object> list = new ArrayList<>();
+    Map<String, Object> nested = new HashMap<>();
+
+    list.add(123);
+    nested.put("key", 456);
+    list.add(nested);
+    config.put("list", list);
+
+    builder.defaultServiceConfig(config);
+    
+    assertThat(builder.defaultServiceConfig)
+            .containsEntry(
+                    "list",
+                    Arrays.asList(123D, Collections.singletonMap("key", 456D)));
   }
 
   @Test