diff --git a/testSystemInformation.cxx b/testSystemInformation.cxx
index ec40e80643613fe28de5c15714c477b21ea47925..49a686c1754c4268c72312fe82328f5ab8a2f0c4 100644
--- a/testSystemInformation.cxx
+++ b/testSystemInformation.cxx
@@ -47,6 +47,8 @@
 
 int testSystemInformation(int, char*[])
 {
+  kwsys_ios::cout << "CTEST_FULL_OUTPUT\n"; // avoid truncation
+
   kwsys::SystemInformation info;
   info.RunCPUCheck();
   info.RunOSCheck();