diff --git a/src/common/regex.cpp b/src/common/regex.cpp
index 2efc4a026b..072ea9df0f 100644
--- a/src/common/regex.cpp
+++ b/src/common/regex.cpp
@@ -38,9 +38,12 @@
     #include "wx/intl.h"
 #endif //WX_PRECOMP
 
-// FreeBSD & Watcom require this, it probably doesn't hurt for others
+// FreeBSD, Watcom and DMars require this, CW doesn't have nor need it.
+// Others also don't seem to need it. If you have an error related to
+// (not) including <sys/types.h> please report details to
+// wx-dev@lists.wxwindows.org
 #if defined(__UNIX__) || defined(__WATCOMC__) || defined(__DIGITALMARS__)
-    #include <sys/types.h>
+#   include <sys/types.h>
 #endif
 
 #ifndef __WXWINCE__
diff --git a/src/regex/regcustom.h b/src/regex/regcustom.h
index 02db688850..d13dcef807 100644
--- a/src/regex/regcustom.h
+++ b/src/regex/regcustom.h
@@ -29,7 +29,15 @@
  */
 
 /* headers if any */
-#include <sys/types.h>
+
+// FreeBSD, Watcom and DMars require this, CW doesn't have nor need it.
+// Others also don't seem to need it. If you have an error related to
+// (not) including <sys/types.h> please report details to
+// wx-dev@lists.wxwindows.org
+#if defined(__UNIX__) || defined(__WATCOMC__) || defined(__DIGITALMARS__)
+#   include <sys/types.h>
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <ctype.h>
diff --git a/src/regex/regex.h b/src/regex/regex.h
index a1fcec2e1c..b3e0e0a8ed 100644
--- a/src/regex/regex.h
+++ b/src/regex/regex.h
@@ -39,7 +39,14 @@
 extern "C" {
 #endif
 
-#include <sys/types.h>
+// FreeBSD, Watcom and DMars require this, CW doesn't have nor need it.
+// Others also don't seem to need it. If you have an error related to
+// (not) including <sys/types.h> please report details to
+// wx-dev@lists.wxwindows.org
+#if defined(__UNIX__) || defined(__WATCOMC__) || defined(__DIGITALMARS__)
+#   include <sys/types.h>
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>