diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 305ebf7435e..712121fe5cc 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2016-02-24  Martin Sebor  <msebor@redhat.com>
+
+	PR c/51147
+	* gcc.dg/enum-mode-2.c: New test.
+
 2016-02-24  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/69922
diff --git a/gcc/testsuite/gcc.dg/enum-mode-2.c b/gcc/testsuite/gcc.dg/enum-mode-2.c
new file mode 100644
index 00000000000..8dba3c53c69
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/enum-mode-2.c
@@ -0,0 +1,22 @@
+/* PR c/51147 - attribute((mode(byte))) on an enum generates wrong code */
+
+/* { dg-do compile } */
+/* { dg-additional-options "-O2 -fdump-tree-optimized" } */
+
+enum _eq_bool
+{
+  false,
+  true
+} __attribute__((mode (byte)));
+
+typedef enum _eq_bool bool;
+
+bool foo (void);
+bool bar (void);
+
+bool test (void)
+{
+  return foo () || bar ();
+}
+
+/* { dg-final { scan-tree-dump-times "foo|bar" 2 "optimized" } } */