diff --git a/CASC/PortfolioMode.cpp b/CASC/PortfolioMode.cpp
index 003093fb73..77a81e85f3 100644
--- a/CASC/PortfolioMode.cpp
+++ b/CASC/PortfolioMode.cpp
@@ -558,10 +558,9 @@ unsigned PortfolioMode::getSliceTime(const vstring &sliceCode)
     vstring sliceInstrStr = sliceCode.substr(bidx,eidx-bidx);
     unsigned sliceInstr;
     ALWAYS(Int::stringToUnsignedInt(sliceInstrStr,sliceInstr));
-    
+
     // sliceTime is in deci second, we assume a roughly 2GHz CPU here
-    sliceTime = sliceInstr / 200;
-    if (sliceTime == 0) { sliceTime = 1; }
+    sliceTime = 1 + sliceInstr / 200; // rather round up than down (and never return 0 here)
   }
 
   return _slowness * sliceTime;