diff --git a/src/sshagent/blf.h b/src/sshagent/blf.h
index 4878e558..f1ac5a5c 100644
--- a/src/sshagent/blf.h
+++ b/src/sshagent/blf.h
@@ -34,17 +34,7 @@
 #ifndef _BLF_H_
 #define _BLF_H_
 
-#ifdef _WIN32
-
-#include <stdint.h>
-
-typedef uint32_t u_int32_t;
-typedef uint16_t u_int16_t;
-typedef uint8_t u_int8_t;
-
-#define bzero(p,s) memset(p, 0, s)
-
-#endif
+#include "includes.h"
 
 #if !defined(HAVE_BCRYPT_PBKDF) && !defined(HAVE_BLH_H)
 
diff --git a/src/sshagent/blowfish.c b/src/sshagent/blowfish.c
index 02e9ac0b..e10f7e7d 100644
--- a/src/sshagent/blowfish.c
+++ b/src/sshagent/blowfish.c
@@ -39,7 +39,7 @@
  * Bruce Schneier.
  */
 
-#define HAVE_BLF_H
+#include "includes.h"
 
 #if !defined(HAVE_BCRYPT_PBKDF) && (!defined(HAVE_BLOWFISH_INITSTATE) || \
     !defined(HAVE_BLOWFISH_EXPAND0STATE) || !defined(HAVE_BLF_ENC))
@@ -51,7 +51,7 @@
 
 #include <sys/types.h>
 #ifdef HAVE_BLF_H
-#include "blf.h"
+#include <blf.h>
 #endif
 
 #undef inline
diff --git a/src/sshagent/includes.h b/src/sshagent/includes.h
new file mode 100644
index 00000000..c6bb4d32
--- /dev/null
+++ b/src/sshagent/includes.h
@@ -0,0 +1,20 @@
+// mimic openSSH-portable's includes.h file to be able to use
+// its unmodified blowfish code
+
+#define HAVE_BLF_H
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE /* activate extra prototypes for glibc */
+#endif
+#include <sys/types.h>
+
+
+#ifdef _WIN32
+#include <stdint.h>
+
+typedef uint32_t u_int32_t;
+typedef uint16_t u_int16_t;
+typedef uint8_t u_int8_t;
+
+#define bzero(p,s) memset(p, 0, s)
+#endif