diff --git a/src/vim9expr.c b/src/vim9expr.c
index 5a302d6..05eb524 100644
--- a/src/vim9expr.c
+++ b/src/vim9expr.c
@@ -407,7 +407,8 @@
 	{
 	    if (*name == '_' && !inside_class(cctx, cl))
 	    {
-		semsg(_(e_cannot_access_private_variable_str), m->ocm_name);
+		semsg(_(e_cannot_access_private_variable_str), m->ocm_name,
+							    cl->class_name);
 		return FAIL;
 	    }
 
@@ -442,7 +443,8 @@
 	    // it is defined.
 	    if (*name == '_' && cctx->ctx_ufunc->uf_class != cl)
 	    {
-		semsg(_(e_cannot_access_private_variable_str), m->ocm_name);
+		semsg(_(e_cannot_access_private_variable_str), m->ocm_name,
+							    cl->class_name);
 		return FAIL;
 	    }