diff --git a/testSystemInformation.cxx b/testSystemInformation.cxx
index cfd7ce2109b1c11a392062177b444b5f557afeeb..2cf13ff007bf9e6b2766e28fff002517c87ecc5a 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();