diff --git a/setup/installer/windows/file_dialogs.cpp b/setup/installer/windows/file_dialogs.cpp
index 85ae307d79..1303182186 100644
--- a/setup/installer/windows/file_dialogs.cpp
+++ b/setup/installer/windows/file_dialogs.cpp
@@ -195,7 +195,7 @@ HANDLE open_named_pipe(LPWSTR pipename) {
             fprintf(stderr, "Failed to open pipe. GetLastError()=%d\n", GetLastError()); fflush(stderr); return ans;
         }
         if (!WaitNamedPipeW(pipename, 20000)) {
-            fprintf(stderr, "Failed to open pipe. 20 second wait timed out.\n", GetLastError()); fflush(stderr); return ans;
+            fprintf(stderr, "Failed to open pipe. 20 second wait timed out. GetLastError()=%d\n", GetLastError()); fflush(stderr); return ans;
         }
     }
     return ans;