diff --git a/plugins/netutils.h b/plugins/netutils.h
index 0ca524f2..c53b3cef 100644
--- a/plugins/netutils.h
+++ b/plugins/netutils.h
@@ -113,7 +113,7 @@ int np_net_ssl_init_with_hostname_version_and_cert(int sd, char *host_name, int
 void np_net_ssl_cleanup();
 int np_net_ssl_write(const void *buf, int num);
 int np_net_ssl_read(void *buf, int num);
-int np_net_ssl_check_cert(int days_till_exp_warn, int days_till_exp_crit);
+mp_state_enum np_net_ssl_check_cert(int days_till_exp_warn, int days_till_exp_crit);
 #endif /* HAVE_SSL */
 
 #endif /* _NETUTILS_H_ */
diff --git a/plugins/sslutils.c b/plugins/sslutils.c
index 92e0cc84..b20a2b2c 100644
--- a/plugins/sslutils.c
+++ b/plugins/sslutils.c
@@ -30,6 +30,7 @@
 #include "common.h"
 #include "netutils.h"
 #include "../lib/monitoringplug.h"
+#include "states.h"
 
 #ifdef HAVE_SSL
 static SSL_CTX *ctx = NULL;
@@ -318,7 +319,7 @@ int np_net_ssl_check_certificate(X509 *certificate, int days_till_exp_warn,
 #	endif /* USE_OPENSSL */
 }
 
-int np_net_ssl_check_cert(int days_till_exp_warn, int days_till_exp_crit) {
+mp_state_enum np_net_ssl_check_cert(int days_till_exp_warn, int days_till_exp_crit) {
 #	ifdef USE_OPENSSL
 	X509 *certificate = NULL;
 	certificate = SSL_get_peer_certificate(s);