diff --git a/core/diagnostics/DiagnosticScenarios/Controllers/DiagnosticScenarios.cs b/core/diagnostics/DiagnosticScenarios/Controllers/DiagnosticScenarios.cs
index ffaf974f33d..4e39f71058f 100644
--- a/core/diagnostics/DiagnosticScenarios/Controllers/DiagnosticScenarios.cs
+++ b/core/diagnostics/DiagnosticScenarios/Controllers/DiagnosticScenarios.cs
@@ -82,8 +82,9 @@ public ActionResult<string> memspike(int seconds)
                 // Cleanup
                 p = null;
 
-                // Call GC.Collect twice
+                // GC
                 GC.Collect();
+                GC.WaitForPendingFinalizers();
                 GC.Collect();
 
                 Thread.Sleep(5000);	// Sleep for 5 seconds before spiking memory again