diff --git a/src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs b/src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs
index ac7d5e5a3ee6d8..646bd7260f6002 100644
--- a/src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs
+++ b/src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs
@@ -108,17 +108,16 @@ public static bool IsPrivilegedProcess
 
         // For use as needed on tests that time out when run on a Debug or Checked runtime.
         // Not relevant for timeouts on external activities, such as network timeouts.
-        public static int SlowRuntimeTimeoutModifier
+        public static int SlowRuntimeTimeoutModifier = GetSlowRuntimeTimeoutModifier();
+
+        private static int GetSlowRuntimeTimeoutModifier()
         {
-            get
-            {
-                if (IsReleaseRuntime)
-                    return 1;
-                if (IsRiscV64Process)
-                    return IsDebugRuntime? 10 : 2;
-                else
-                    return IsDebugRuntime? 5 : 1;
-            }
+            if (IsReleaseRuntime)
+                return 1;
+            if (IsRiscV64Process)
+                return IsDebugRuntime? 10 : 2;
+            else
+                return IsDebugRuntime? 5 : 1;
         }
 
         public static bool IsCaseInsensitiveOS => IsWindows || IsOSX || IsMacCatalyst;