diff --git a/src/System.Private.CoreLib/shared/System/Globalization/TimeSpanParse.cs b/src/System.Private.CoreLib/shared/System/Globalization/TimeSpanParse.cs
index 1bf81742a075..a63554377049 100644
--- a/src/System.Private.CoreLib/shared/System/Globalization/TimeSpanParse.cs
+++ b/src/System.Private.CoreLib/shared/System/Globalization/TimeSpanParse.cs
@@ -116,7 +116,7 @@ public bool IsInvalidFraction()
                     return false;
 
                 // num > 0 && zeroes > 0 && num <= maxValue && zeroes <= maxPrecision
-                return _num >= MaxFraction / Pow10(_zeroes - 1);
+                return _num >= MaxFraction / Pow10(_zeroes);
             }
         }