diff --git a/plugins/router_basicauth/router_basicauth.c b/plugins/router_basicauth/router_basicauth.c
index 2a9b27fc..9f47a4e4 100644
--- a/plugins/router_basicauth/router_basicauth.c
+++ b/plugins/router_basicauth/router_basicauth.c
@@ -4,6 +4,9 @@
 
 #ifdef __linux__
 #include <crypt.h>
+#elif defined(__CYGWIN__)
+#include <crypt.h>
+pthread_mutex_t ur_basicauth_crypt_mutex;
 #else
 pthread_mutex_t ur_basicauth_crypt_mutex;
 #endif