diff --git a/Tests/CMakeLib/testEncoding.cxx b/Tests/CMakeLib/testEncoding.cxx
index 20ba9e3bfe..403c896e5a 100644
--- a/Tests/CMakeLib/testEncoding.cxx
+++ b/Tests/CMakeLib/testEncoding.cxx
@@ -1,4 +1,4 @@
-#include <fstream>
+#include <cmsys/FStream.hxx>
 #include <iostream>
 #include <string>
 
@@ -39,7 +39,7 @@ int main(int argc, char* argv[])
     setEncoding(consoleOut, CP_OEMCP);
   } // else AUTO
 #endif
-  std::ifstream file(argv[2]);
+  cmsys::ifstream file(argv[2]);
   if (!file.is_open()) {
     std::cout << "Failed to open file: " << argv[2] << std::endl;
     return 2;