diff --git a/libs/freetdm/src/testsangomaboost.c b/libs/freetdm/src/testsangomaboost.c
index 85b5332635..84ff287830 100644
--- a/libs/freetdm/src/testsangomaboost.c
+++ b/libs/freetdm/src/testsangomaboost.c
@@ -49,7 +49,9 @@
 #include <string.h>
 #include <errno.h>
 #ifdef __linux__
+#ifndef __USE_BSD
 #define __USE_BSD
+#endif
 #include <unistd.h>
 #endif
 #include "freetdm.h"