diff --git a/ion/src/main/java/com/fasterxml/jackson/dataformat/ion/IonParser.java b/ion/src/main/java/com/fasterxml/jackson/dataformat/ion/IonParser.java
index bf5653267..21a30775d 100644
--- a/ion/src/main/java/com/fasterxml/jackson/dataformat/ion/IonParser.java
+++ b/ion/src/main/java/com/fasterxml/jackson/dataformat/ion/IonParser.java
@@ -413,8 +413,8 @@ private long _getLongValue() throws IOException {
         try {
             if (this.getNumberType() == NumberType.BIG_INTEGER) {
                 BigInteger bigInteger = _reader.bigIntegerValue();
-                if (BI_MIN_INT.compareTo(bigInteger) > 0 || BI_MAX_INT.compareTo(bigInteger) < 0) {
-                    this.reportOverflowLong();
+                if (BI_MIN_LONG.compareTo(bigInteger) > 0 || BI_MAX_LONG.compareTo(bigInteger) < 0) {
+                    reportOverflowLong();
                 }
                 return bigInteger.longValue();
             } else {
diff --git a/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/IonNumberOverflowTest.java b/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/IonNumberOverflowTest.java
index d99f10adc..8793d3c41 100644
--- a/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/IonNumberOverflowTest.java
+++ b/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/IonNumberOverflowTest.java
@@ -3,6 +3,8 @@
 import org.hamcrest.Matchers;
 import org.junit.Test;
 
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.JsonToken;
 import com.fasterxml.jackson.core.exc.InputCoercionException;
 
 import static org.hamcrest.MatcherAssert.assertThat;
@@ -72,4 +74,15 @@ private void _testLongCoercionFail(BigInteger input) throws Exception
         }
     }
 
+    // [dataformats-binary#569]: incorrect overflow fail for long values (from BigInteger)
+    @Test
+    public void testLongAsBigIntegerSize() throws Exception {
+        // Note: Values: Long.MAX_VALUE through Long.MAX_VALUE -7 are considered LONG by Ion.  
+        BigInteger bigIntLongValue = new BigInteger(Long.MAX_VALUE + "").subtract(BigInteger.TEN);
+        IonParser bigIntLongParser = (IonParser) new IonFactory().createParser(bigIntLongValue.toString());
+        assertEquals(JsonToken.VALUE_NUMBER_INT, bigIntLongParser.nextToken());
+        assertEquals(JsonParser.NumberType.BIG_INTEGER, bigIntLongParser.getNumberType());
+        assertEquals(JsonParser.NumberTypeFP.UNKNOWN, bigIntLongParser.getNumberTypeFP());
+        assertEquals(bigIntLongValue.longValue(), bigIntLongParser.getLongValue());
+    }    
 }
diff --git a/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/fuzz/IonFuzz_469_66149_NegArraySizeTest.java b/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/fuzz/IonFuzz_469_66149_NegArraySizeTest.java
index 718cd098e..1f39552f9 100644
--- a/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/fuzz/IonFuzz_469_66149_NegArraySizeTest.java
+++ b/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/fuzz/IonFuzz_469_66149_NegArraySizeTest.java
@@ -6,7 +6,6 @@
 import com.fasterxml.jackson.core.exc.StreamReadException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.dataformat.ion.*;
-import com.fasterxml.jackson.dataformat.ion.fuzz.IonFuzzTestUtil;
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.junit.Assert.fail;
diff --git a/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/fuzz/IonFuzz_471_66141_AssertionErrorTest.java b/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/fuzz/IonFuzz_471_66141_AssertionErrorTest.java
index e6ddbfb2d..145d2b828 100644
--- a/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/fuzz/IonFuzz_471_66141_AssertionErrorTest.java
+++ b/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/fuzz/IonFuzz_471_66141_AssertionErrorTest.java
@@ -6,7 +6,6 @@
 import com.fasterxml.jackson.core.exc.StreamReadException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.dataformat.ion.*;
-import com.fasterxml.jackson.dataformat.ion.fuzz.IonFuzzTestUtil;
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.junit.Assert.fail;
diff --git a/release-notes/VERSION-2.x b/release-notes/VERSION-2.x
index 43d9e38c2..d24b136bb 100644
--- a/release-notes/VERSION-2.x
+++ b/release-notes/VERSION-2.x
@@ -16,6 +16,9 @@ Active maintainers:
 
 2.18.4 (not yet released)
 
+#569: (ion) `IonParser` fails to parse some `long` values saying
+  they are out of range when they are not
+ (reported, fix suggested by @seadbrane)
 - (ion) Upgrade `ion-java` to 1.11.10 (from 1.11.9)
 
 2.18.3 (28-Feb-2025)