diff --git a/mojo/public/c/system/tests/buffer_unittest.cc b/mojo/public/c/system/tests/buffer_unittest.cc
index 9d29dc9..5c5ebe0 100644
--- a/mojo/public/c/system/tests/buffer_unittest.cc
+++ b/mojo/public/c/system/tests/buffer_unittest.cc
@@ -40,13 +40,7 @@
   EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT, MojoUnmapBuffer(nullptr));
 }
 
-// TODO(ncbray): enable this test once NaCl supports the corresponding APIs.
-#ifdef __native_client__
-#define MAYBE_Basic DISABLED_Basic
-#else
-#define MAYBE_Basic Basic
-#endif
-TEST(BufferTest, MAYBE_Basic) {
+TEST(BufferTest, Basic) {
   // Create a shared buffer (|h0|).
   MojoHandle h0 = MOJO_HANDLE_INVALID;
   EXPECT_EQ(MOJO_RESULT_OK, MojoCreateSharedBuffer(nullptr, 100, &h0));
diff --git a/mojo/public/c/system/tests/data_pipe_unittest.cc b/mojo/public/c/system/tests/data_pipe_unittest.cc
index fb89e31..7c0a1e4 100644
--- a/mojo/public/c/system/tests/data_pipe_unittest.cc
+++ b/mojo/public/c/system/tests/data_pipe_unittest.cc
@@ -63,13 +63,7 @@
             MojoEndReadData(MOJO_HANDLE_INVALID, 1u));
 }
 
-// TODO(ncbray): enable this test once NaCl supports the corresponding APIs.
-#ifdef __native_client__
-#define MAYBE_Basic DISABLED_Basic
-#else
-#define MAYBE_Basic Basic
-#endif
-TEST(DataPipeTest, MAYBE_Basic) {
+TEST(DataPipeTest, Basic) {
   MojoHandle hp = MOJO_HANDLE_INVALID;
   MojoHandle hc = MOJO_HANDLE_INVALID;
   EXPECT_EQ(MOJO_RESULT_OK, MojoCreateDataPipe(nullptr, &hp, &hc));
diff --git a/mojo/public/cpp/system/tests/core_unittest.cc b/mojo/public/cpp/system/tests/core_unittest.cc
index 1843c37..8dc592f 100644
--- a/mojo/public/cpp/system/tests/core_unittest.cc
+++ b/mojo/public/cpp/system/tests/core_unittest.cc
@@ -544,13 +544,7 @@
   }
 }
 
-// TODO(ncbray): enable this test once NaCl supports the corresponding APIs.
-#ifdef __native_client__
-#define MAYBE_DataPipe DISABLED_DataPipe
-#else
-#define MAYBE_DataPipe DataPipe
-#endif
-TEST(CoreCppTest, MAYBE_DataPipe) {
+TEST(CoreCppTest, DataPipe) {
   ScopedDataPipeProducerHandle ph;
   ScopedDataPipeConsumerHandle ch;