diff --git a/Source/cmRegularExpression.h b/Source/cmRegularExpression.h
index 755b54b5f..6a46e3e02 100644
--- a/Source/cmRegularExpression.h
+++ b/Source/cmRegularExpression.h
@@ -176,7 +176,7 @@ const int NSUBEXP = 10;
  *      the line.  It would match "drepa qrepb" in "rep drepa qrepb".
  *
  */
-class cmRegularExpression 
+class CM_EXPORT cmRegularExpression 
 {
 public:
   /**