diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 940f367567e..f6903b0f741 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2015-07-01  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* gcc.target/i386/mpx/pr66568.c (exit): New prototype.
+
 2015-07-01  Jason Merrill  <jason@redhat.com>
 
 	* lib/target-supports.exp (cxx_default): Set to C++14.
diff --git a/gcc/testsuite/gcc.target/i386/mpx/pr66568.c b/gcc/testsuite/gcc.target/i386/mpx/pr66568.c
index d7bb9f6e31d..2653ebc0fa0 100644
--- a/gcc/testsuite/gcc.target/i386/mpx/pr66568.c
+++ b/gcc/testsuite/gcc.target/i386/mpx/pr66568.c
@@ -2,6 +2,7 @@
 /* { dg-require-effective-target fpic } */
 /* { dg-options "-O2 -fcheck-pointer-bounds -mmpx -O2 -fPIC" } */
 
+extern void exit (int);
 int a, b, c;
 void *set_test () {
   if (b)