diff --git a/src/main/java/com/fasterxml/jackson/databind/util/ISO8601Utils.java b/src/main/java/com/fasterxml/jackson/databind/util/ISO8601Utils.java
index 7a328ca4d3..4760eb3aad 100644
--- a/src/main/java/com/fasterxml/jackson/databind/util/ISO8601Utils.java
+++ b/src/main/java/com/fasterxml/jackson/databind/util/ISO8601Utils.java
@@ -311,14 +311,14 @@ private static int parseInt(String value, int beginIndex, int endIndex) throws N
         if (i < endIndex) {
             digit = Character.digit(value.charAt(i++), 10);
             if (digit < 0) {
-                throw new NumberFormatException("Invalid number: " + value);
+                throw new NumberFormatException("Invalid number: " + value.substring(beginIndex, endIndex));
             }
             result = -digit;
         }
         while (i < endIndex) {
             digit = Character.digit(value.charAt(i++), 10);
             if (digit < 0) {
-                throw new NumberFormatException("Invalid number: " + value);
+                throw new NumberFormatException("Invalid number: " + value.substring(beginIndex, endIndex));
             }
             result *= 10;
             result -= digit;