diff --git a/lib/ssh.c b/lib/ssh.c
index 21f4f9dbcb..6b849c611e 100644
--- a/lib/ssh.c
+++ b/lib/ssh.c
@@ -94,6 +94,9 @@
 #ifdef WIN32
 #  undef  PATH_MAX
 #  define PATH_MAX MAX_PATH
+#  ifndef R_OK
+#    define R_OK 4
+#  endif
 #endif
 
 #ifndef PATH_MAX