diff --git a/src/Orleans/Configuration/ConfigUtilities.cs b/src/Orleans/Configuration/ConfigUtilities.cs
index eefd1f0f8e2..b6a5a7436d3 100644
--- a/src/Orleans/Configuration/ConfigUtilities.cs
+++ b/src/Orleans/Configuration/ConfigUtilities.cs
@@ -311,8 +311,8 @@ internal static TimeSpan ParseTimeSpan(string input, string errorMessage)
                 unitSize = 1000; // Default is seconds
                 numberInput = trimmedInput;
             }
-            int rawTimeSpan;
-            if (!Int32.TryParse(numberInput, out rawTimeSpan))
+            double rawTimeSpan;
+            if (!double.TryParse(numberInput, out rawTimeSpan))
             {
                 throw new FormatException(errorMessage + ". Tried to parse " + input);
             }