diff --git a/include/libvirt/virterror.h b/include/libvirt/virterror.h
index 44292c7021..f41afcd0a7 100644
--- a/include/libvirt/virterror.h
+++ b/include/libvirt/virterror.h
@@ -321,6 +321,11 @@ typedef enum {
     VIR_ERR_DEVICE_MISSING = 99,        /* fail to find the desired device */
     VIR_ERR_INVALID_NWFILTER_BINDING = 100,  /* invalid nwfilter binding */
     VIR_ERR_NO_NWFILTER_BINDING = 101,  /* no nwfilter binding */
+
+# ifdef VIR_ENUM_SENTINELS
+    VIR_ERR_NUMBER_LAST
+# endif
+
 } virErrorNumber;
 
 /**
diff --git a/src/util/virerror.c b/src/util/virerror.c
index 736c92fd02..88e6ecef82 100644
--- a/src/util/virerror.c
+++ b/src/util/virerror.c
@@ -914,6 +914,7 @@ virErrorMsg(virErrorNumber error, const char *info)
     const char *errmsg = NULL;
 
     switch (error) {
+        case VIR_ERR_NUMBER_LAST:
         case VIR_ERR_OK:
             return NULL;
         case VIR_ERR_INTERNAL_ERROR: