diff --git a/src/parse.c b/src/parse.c
index dcc2c4f8f908..974f29b296c1 100644
--- a/src/parse.c
+++ b/src/parse.c
@@ -2172,7 +2172,7 @@ BaseClasses *Parser::parseBaseClasses()
             default: break;
         }
         if (prot)
-            deprecation("use of base class protection is deprecated");
+            error("use of base class protection is no longer supported");
         BaseClass *b = new BaseClass(parseBasicType(), protection);
         baseclasses->push(b);
         if (token.value != TOKcomma)
diff --git a/test/fail_compilation/fail5299.d b/test/fail_compilation/fail5299.d
new file mode 100644
index 000000000000..d5e8752f2fd3
--- /dev/null
+++ b/test/fail_compilation/fail5299.d
@@ -0,0 +1,14 @@
+/*
+TEST_OUTPUT:
+---
+fail_compilation/fail5299.d(12): Error: use of base class protection is no longer supported
+---
+*/
+
+class A
+{
+}
+
+class B : private A
+{
+}