diff --git a/lib/mac/cryb_hmac_sha1.c b/lib/mac/cryb_hmac_sha1.c
index 26f6900..c2bf389 100644
--- a/lib/mac/cryb_hmac_sha1.c
+++ b/lib/mac/cryb_hmac_sha1.c
@@ -35,7 +35,6 @@
 #endif
 
 #if HAVE_ENDIAN_H
-#define _BSD_SOURCE
 #include <endian.h>
 #endif
 
diff --git a/lib/mac/cryb_hmac_sha224.c b/lib/mac/cryb_hmac_sha224.c
index 91bbd77..1d9bd6a 100644
--- a/lib/mac/cryb_hmac_sha224.c
+++ b/lib/mac/cryb_hmac_sha224.c
@@ -35,7 +35,6 @@
 #endif
 
 #if HAVE_ENDIAN_H
-#define _BSD_SOURCE
 #include <endian.h>
 #endif
 
diff --git a/lib/mac/cryb_hmac_sha256.c b/lib/mac/cryb_hmac_sha256.c
index 126ed63..10f376c 100644
--- a/lib/mac/cryb_hmac_sha256.c
+++ b/lib/mac/cryb_hmac_sha256.c
@@ -35,7 +35,6 @@
 #endif
 
 #if HAVE_ENDIAN_H
-#define _BSD_SOURCE
 #include <endian.h>
 #endif
 
diff --git a/lib/mac/cryb_hmac_sha384.c b/lib/mac/cryb_hmac_sha384.c
index b5efe1e..d70b171 100644
--- a/lib/mac/cryb_hmac_sha384.c
+++ b/lib/mac/cryb_hmac_sha384.c
@@ -35,7 +35,6 @@
 #endif
 
 #if HAVE_ENDIAN_H
-#define _BSD_SOURCE
 #include <endian.h>
 #endif
 
diff --git a/lib/mac/cryb_hmac_sha512.c b/lib/mac/cryb_hmac_sha512.c
index 1935a1a..e083e48 100644
--- a/lib/mac/cryb_hmac_sha512.c
+++ b/lib/mac/cryb_hmac_sha512.c
@@ -35,7 +35,6 @@
 #endif
 
 #if HAVE_ENDIAN_H
-#define _BSD_SOURCE
 #include <endian.h>
 #endif