diff --git a/examples/rsa-decrypt.c b/examples/rsa-decrypt.c
index 52b8b4c7b5b51fbadccb339cc89d1a10cacd3ad9..eac6fdd58ea1ede887324d31e8e7924016e452b8 100644
--- a/examples/rsa-decrypt.c
+++ b/examples/rsa-decrypt.c
@@ -32,9 +32,6 @@
 #include <stdio.h>
 #include <string.h>
 
-/* For getopt */
-#include <unistd.h>
-
 /* string.h must be included before gmp.h */
 #include "aes.h"
 #include "bignum.h"
@@ -48,6 +45,8 @@
 #include "io.h"
 #include "rsa-session.h"
 
+#include "getopt.h"
+
 void
 rsa_session_set_decrypt_key(struct rsa_session *ctx,
 			    const struct rsa_session_info *key)
diff --git a/examples/rsa-encrypt.c b/examples/rsa-encrypt.c
index cb0e82095349f5d8c333e685285632e0d92adb6e..7bfb6f97547a872a7a95da0e16f42b4dcaf96085 100644
--- a/examples/rsa-encrypt.c
+++ b/examples/rsa-encrypt.c
@@ -32,9 +32,6 @@
 #include <stdio.h>
 #include <string.h>
 
-/* For getopt */
-#include <unistd.h>
-
 /* string.h must be included before gmp.h */
 #include "bignum.h"
 #include "buffer.h"
@@ -45,6 +42,8 @@
 #include "io.h"
 #include "rsa-session.h"
 
+#include "getopt.h"
+
 void
 rsa_session_set_encrypt_key(struct rsa_session *ctx,
 			    const struct rsa_session_info *key)
diff --git a/examples/rsa-keygen.c b/examples/rsa-keygen.c
index 675f13f4b5d1b4294deb40e7124076f93f82b565..b9d4ff9d13a7803041cd512b21c6d91b0b01414f 100644
--- a/examples/rsa-keygen.c
+++ b/examples/rsa-keygen.c
@@ -32,9 +32,6 @@
 #include <stdio.h>
 #include <string.h>
 
-/* For getopt */
-#include <unistd.h>
-
 #include "buffer.h"
 #include "rsa.h"
 #include "sexp.h"
@@ -42,6 +39,8 @@
 
 #include "io.h"
 
+#include "getopt.h"
+
 #define KEYSIZE 900
 #define ESIZE 30