1 files changed, 1 insertions, 1 deletions
diff --git a/luni/src/main/java/org/apache/harmony/security/asn1/ObjectIdentifier.java b/luni/src/main/java/org/apache/harmony/security/asn1/ObjectIdentifier.java
index 24140e5..eb1e3e3 100644
--- a/luni/src/main/java/org/apache/harmony/security/asn1/ObjectIdentifier.java
+++ b/luni/src/main/java/org/apache/harmony/security/asn1/ObjectIdentifier.java
@@ -190,7 +190,7 @@ public final class ObjectIdentifier {
             if (! shouldThrow) {
                 return null;
             }
-            throw new IllegalArgumentException();
+            throw new IllegalArgumentException("str == null");
         }
 
         int length = str.length();