diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index d6b6780be13..7ba5ea3c39d 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2018-10-31  Nathan Sidwell  <nathan@acm.org>
+
+	* g++.dg/lookup/friend21.C: New.
+
 2018-10-31  Martin Liska  <mliska@suse.cz>
 
 	PR driver/83193
diff --git a/gcc/testsuite/g++.dg/lookup/friend21.C b/gcc/testsuite/g++.dg/lookup/friend21.C
new file mode 100644
index 00000000000..ed02d36d03d
--- /dev/null
+++ b/gcc/testsuite/g++.dg/lookup/friend21.C
@@ -0,0 +1,14 @@
+// Unhiding a friend erroneously mutated a binding
+
+class X 
+{
+  friend void frob (int, int);
+};
+  
+void frob (int);
+void frob (int, int);
+
+void foo ()
+{
+  frob (1); // Only saw unhidden friend
+}