diff --git a/programs/ssl/ssl_mail_client.c b/programs/ssl/ssl_mail_client.c
index 8958f18f7..8a7850e91 100644
--- a/programs/ssl/ssl_mail_client.c
+++ b/programs/ssl/ssl_mail_client.c
@@ -57,8 +57,10 @@
 #include <unistd.h>
 #else
 #include <io.h>
-#define read(fd, buf, len)  _read( fd, (void *)buf, (unsigned int)len )
-#define write(fd, buf, len) _write( fd, (const void *)buf, (unsigned int)len )
+#define read(fd, buf, len)                                      \
+    _read( fd, (void *)( buf ), (unsigned int)( len ) )
+#define write(fd, buf, len)                                     \
+    _write( fd, (const void *)( buf ), (unsigned int)( len ) )
 #endif
 
 #if defined(_WIN32) || defined(_WIN32_WCE)