diff --git a/Source/kwsys/SystemInformation.hxx.in b/Source/kwsys/SystemInformation.hxx.in
index 0267518d1..0fde9278e 100644
--- a/Source/kwsys/SystemInformation.hxx.in
+++ b/Source/kwsys/SystemInformation.hxx.in
@@ -31,7 +31,7 @@ namespace @KWSYS_NAMESPACE@
 // forward declare the implementation class  
 class SystemInformationImplementation;
   
-class SystemInformation 
+class @KWSYS_NAMESPACE@_EXPORT SystemInformation 
 {
 
 public: