diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index d4611b83b4c..6793e9d39d6 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,9 @@
+2015-03-25  Alan Lawrence  <alan.lawrence@arm.com>
+
+	PR libstdc++/33394
+	* testsuite/21_strings/basic_string/pthread33394.cc: Use
+	dg-additional-options.
+
 2015-03-25  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR libstdc++/65543
diff --git a/libstdc++-v3/testsuite/21_strings/basic_string/pthread33394.cc b/libstdc++-v3/testsuite/21_strings/basic_string/pthread33394.cc
index c706504bd53..4674974f4e3 100644
--- a/libstdc++-v3/testsuite/21_strings/basic_string/pthread33394.cc
+++ b/libstdc++-v3/testsuite/21_strings/basic_string/pthread33394.cc
@@ -18,7 +18,7 @@
 // { dg-do run { target *-*-freebsd* *-*-dragonfly* *-*-netbsd* *-*-linux* *-*-gnu* *-*-solaris* *-*-cygwin *-*-darwin* } }
 // { dg-options "-pthread" { target *-*-freebsd* *-*-dragonfly* *-*-netbsd* *-*-linux* *-*-gnu* *-*-solaris* } }
 
-// { dg-options "-DITERATIONS=1000" { target simulator } }
+// { dg-additional-options "-DITERATIONS=1000" { target simulator } }
 #ifndef ITERATIONS
 #define ITERATIONS 50000
 #endif