diff --git a/tools/source/generic/bigint.cxx b/tools/source/generic/bigint.cxx
index 07f1806e5bd1..5298cd9c9c8e 100644
--- a/tools/source/generic/bigint.cxx
+++ b/tools/source/generic/bigint.cxx
@@ -570,7 +570,9 @@ BigInt::BigInt( sal_uInt32 nValue )
     else
     {
         bIsBig = false;
+        bIsNeg = false;
         nVal   = nValue;
+        nLen   = 0;
     }
 }