diff --git a/GVFS/GVFS.FunctionalTests/Tools/GitProcess.cs b/GVFS/GVFS.FunctionalTests/Tools/GitProcess.cs
index bc2135465..abc94f06d 100644
--- a/GVFS/GVFS.FunctionalTests/Tools/GitProcess.cs
+++ b/GVFS/GVFS.FunctionalTests/Tools/GitProcess.cs
@@ -35,6 +35,9 @@ public static ProcessResult InvokeProcess(
             }
 
             processInfo.EnvironmentVariables["GIT_TERMINAL_PROMPT"] = "0";
+            // Suppress progress output (e.g. "Updating files: 100%") which is timing-dependent
+            // and causes flaky stderr comparisons between control and GVFS repos.
+            processInfo.EnvironmentVariables["GIT_PROGRESS_DELAY"] = "3600";
 
             if (environmentVariables != null)
             {