diff --git a/renderdocui/Windows/Dialogs/ProgressPopup.cs b/renderdocui/Windows/Dialogs/ProgressPopup.cs
index 2163d0de6..3f3f33fa2 100644
--- a/renderdocui/Windows/Dialogs/ProgressPopup.cs
+++ b/renderdocui/Windows/Dialogs/ProgressPopup.cs
@@ -70,6 +70,7 @@ namespace renderdocui.Windows
                     return;
                 }
 
+                f = Helpers.Clamp(f, 0.0f, 1.0f);
                 progressBar.Value = (int)(progressBar.Maximum * f);
             }));
         }