diff --git a/headers/private/mail/regex.h b/headers/private/mail/regex.h
index ab9c90c8ae..32c415681d 100644
--- a/headers/private/mail/regex.h
+++ b/headers/private/mail/regex.h
@@ -21,7 +21,7 @@
    Boston, MA 02111-1307, USA.  */
 
 /* BeOS PPC has no regex in libroot */
-#if !__POWERPC__
+#if !(defined(__BEOS__) && __POWERPC__)
 #	include <posix/regex.h>
 #else