diff --git a/src/komodo.h b/src/komodo.h
index 6c243e6f8..23d53941e 100644
--- a/src/komodo.h
+++ b/src/komodo.h
@@ -278,7 +278,7 @@ uint64_t komodo_interest(uint64_t nValue,uint32_t nLockTime,uint32_t tiptime)
     {
         minutes = (tiptime - nLockTime) / 60;
         days = minutes / (24 * 60);
-        interest = (nValue * 5000000) / ((365 * 1000000 * 24 * 60) / minutes);
+        interest = (nValue * 5000000) / (((uint64_t)365 * 1000000 * 24 * 60) / minutes);
         fprintf(stderr,"komodo_interest %lld %.8f nLockTime.%u tiptime.%u minutes.%d days.%d interest %lld %.8f\n",(long long)nValue,(double)nValue/100000000.,nLockTime,tiptime,minutes,days,(long long)interest,(double)interest/100000000);
     }
     return(interest * 0);