diff --git a/src/OSspecific/MSWindows/regExp.C b/src/OSspecific/MSWindows/regExp.C
index 172e54555..519142c14 100644
--- a/src/OSspecific/MSWindows/regExp.C
+++ b/src/OSspecific/MSWindows/regExp.C
@@ -25,7 +25,7 @@ License
 
 #include "regExp.H"
 #include "label.H"
-#include "string.H"
+#include "foamString.H"
 #include "List.H"
 #include "IOstreams.H"