diff --git a/lib/krb5/fcache.c b/lib/krb5/fcache.c
index dbe0af9b5..5557bfffc 100644
--- a/lib/krb5/fcache.c
+++ b/lib/krb5/fcache.c
@@ -40,10 +40,6 @@
 
 RCSID("$Id$");
 
-#ifndef O_BINARY
-#define O_BINARY 0
-#endif
-
 typedef struct krb5_fcache{
     char *filename;
     int version;
diff --git a/lib/krb5/keytab_file.c b/lib/krb5/keytab_file.c
index a0ad10b43..1dae081a5 100644
--- a/lib/krb5/keytab_file.c
+++ b/lib/krb5/keytab_file.c
@@ -40,10 +40,6 @@
 
 RCSID("$Id$");
 
-#ifndef O_BINARY
-#define O_BINARY 0
-#endif
-
 #define KRB5_KT_VNO_1 1
 #define KRB5_KT_VNO_2 2
 #define KRB5_KT_VNO   KRB5_KT_VNO_2
diff --git a/lib/krb5/keytab_krb4.c b/lib/krb5/keytab_krb4.c
index 60e73aa9d..d9621fc96 100644
--- a/lib/krb5/keytab_krb4.c
+++ b/lib/krb5/keytab_krb4.c
@@ -41,10 +41,6 @@
 
 RCSID("$Id$");
 
-#ifndef O_BINARY
-#define O_BINARY 0
-#endif
-
 struct krb4_kt_data {
     char *filename;
 };