diff --git a/src/dawn_native/metal/BackendMTL.mm b/src/dawn_native/metal/BackendMTL.mm
index 093cceb5af..a5e7c474fb 100644
--- a/src/dawn_native/metal/BackendMTL.mm
+++ b/src/dawn_native/metal/BackendMTL.mm
@@ -220,6 +220,8 @@ namespace dawn_native { namespace metal {
                 mSupportedExtensions.EnableExtension(Extension::TimestampQuery);
             }
 #endif
+
+            mSupportedExtensions.EnableExtension(Extension::ShaderFloat16);
         }
 
         id<MTLDevice> mDevice = nil;
diff --git a/src/tests/end2end/ShaderFloat16Tests.cpp b/src/tests/end2end/ShaderFloat16Tests.cpp
index 57d94beae2..fa0fd4784c 100644
--- a/src/tests/end2end/ShaderFloat16Tests.cpp
+++ b/src/tests/end2end/ShaderFloat16Tests.cpp
@@ -108,4 +108,4 @@ TEST_P(ShaderFloat16Tests, Basic16BitFloatFeaturesTest) {
     EXPECT_BUFFER_U16_RANGE_EQ(expected, bufferOut, 0, 2);
 }
 
-DAWN_INSTANTIATE_TEST(ShaderFloat16Tests, VulkanBackend());
\ No newline at end of file
+DAWN_INSTANTIATE_TEST(ShaderFloat16Tests, MetalBackend(), VulkanBackend());