diff --git a/moshi/src/main/java/com/squareup/moshi/-JsonUtf8Reader.kt b/moshi/src/main/java/com/squareup/moshi/-JsonUtf8Reader.kt
index adea13fc1..4cfc34348 100644
--- a/moshi/src/main/java/com/squareup/moshi/-JsonUtf8Reader.kt
+++ b/moshi/src/main/java/com/squareup/moshi/-JsonUtf8Reader.kt
@@ -468,7 +468,7 @@ internal class `-JsonUtf8Reader` : JsonReader {
             }
 
             NUMBER_CHAR_DIGIT -> {
-              if (value == 0L) {
+              if (fitsInLong && value == 0L) {
                 return PEEKED_NONE // Leading '0' prefix is not allowed (since it could be octal).
               }
               val newValue = value * 10 - (c - '0').toLong()
diff --git a/moshi/src/test/java/com/squareup/moshi/JsonUtf8ReaderTest.java b/moshi/src/test/java/com/squareup/moshi/JsonUtf8ReaderTest.java
index 551f3b73a..d7450a6f9 100644
--- a/moshi/src/test/java/com/squareup/moshi/JsonUtf8ReaderTest.java
+++ b/moshi/src/test/java/com/squareup/moshi/JsonUtf8ReaderTest.java
@@ -362,6 +362,19 @@ public void negativeZeroIsANumber() throws Exception {
     assertEquals("-0", reader.nextString());
   }
 
+  /**
+   * Regression test for a bug where {@code peekNumber} rejected a valid numeric literal whose
+   * prefix happened to be a multiple of 2<sup>64</sup>. The {@code long} accumulator wraps to
+   * exactly zero in that case, which the old "leading zero" guard misread as an octal prefix.
+   */
+  @Test
+  public void numberLongAccumulatorOverflowsToZero() throws IOException {
+    String number = "184467440737095516160";
+    JsonReader reader = newReader(number);
+    assertThat(reader.peek()).isEqualTo(NUMBER);
+    assertThat(reader.nextString()).isEqualTo(number);
+  }
+
   @Test
   public void numberToStringCoersion() throws Exception {
     JsonReader reader = newReader("[0, 9223372036854775807, 2.5, 3.010, \"a\", \"5\"]");