--- gcc-3.3.5/gcc/cppexp.c
+++ gcc-3.3.5/gcc/cppexp.c
@@ -1448,6 +1448,7 @@
   result.high += HIGH_PART (middle[0]);
   result.high += HIGH_PART (middle[1]);
   result.unsignedp = 1;
+  result.overflow = 0;
 
   return result;
 }