diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array_fsizeddeallocation.sh.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array_fsizeddeallocation.sh.cpp
index f71cf19cc..e02c594c5 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array_fsizeddeallocation.sh.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array_fsizeddeallocation.sh.cpp
@@ -21,7 +21,7 @@
 
 
 // NOTE: Only clang-3.7 and GCC 5.1 and greater support -fsized-deallocation.
-// REQUIRES: fsized-deallocation
+// REQUIRES: -fsized-deallocation
 
 // RUN: %build -fsized-deallocation
 // RUN: %run
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_fsizeddeallocation.sh.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_fsizeddeallocation.sh.cpp
index d5b610f71..21ae88944 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_fsizeddeallocation.sh.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_fsizeddeallocation.sh.cpp
@@ -20,7 +20,7 @@
 // XFAIL: availability_markup=macosx10.7
 
 // NOTE: Only clang-3.7 and GCC 5.1 and greater support -fsized-deallocation.
-// REQUIRES: fsized-deallocation
+// REQUIRES: -fsized-deallocation
 
 // RUN: %build -fsized-deallocation -O3
 // RUN: %run
diff --git a/utils/libcxx/test/config.py b/utils/libcxx/test/config.py
index 62a13938b..7467511cd 100644
--- a/utils/libcxx/test/config.py
+++ b/utils/libcxx/test/config.py
@@ -446,7 +446,7 @@ class Configuration(object):
         # Run a compile test for the -fsized-deallocation flag. This is needed
         # in test/std/language.support/support.dynamic/new.delete
         if self.cxx.hasCompileFlag('-fsized-deallocation'):
-            self.config.available_features.add('fsized-deallocation')
+            self.config.available_features.add('-fsized-deallocation')
 
         if self.cxx.hasCompileFlag('-faligned-allocation'):
             self.config.available_features.add('-faligned-allocation')