diff --git a/src/tests/DawnTest.cpp b/src/tests/DawnTest.cpp
index e01d1672c4..530b464ccc 100644
--- a/src/tests/DawnTest.cpp
+++ b/src/tests/DawnTest.cpp
@@ -819,6 +819,10 @@ bool DawnTestBase::RunSuppressedTests() const {
     return gTestEnv->RunSuppressedTests();
 }
 
+bool DawnTestBase::IsDXC() const {
+    return HasToggleEnabled("use_dxc");
+}
+
 bool DawnTestBase::IsAsan() const {
 #if defined(ADDRESS_SANITIZER)
     return true;
diff --git a/src/tests/DawnTest.h b/src/tests/DawnTest.h
index 911b8c4c7c..b3afb7d21b 100644
--- a/src/tests/DawnTest.h
+++ b/src/tests/DawnTest.h
@@ -295,6 +295,8 @@ class DawnTestBase {
     bool IsBackendValidationEnabled() const;
     bool RunSuppressedTests() const;
 
+    bool IsDXC() const;
+
     bool IsAsan() const;
 
     bool HasToggleEnabled(const char* workaround) const;
diff --git a/src/tests/end2end/VertexFormatTests.cpp b/src/tests/end2end/VertexFormatTests.cpp
index 68f39ec6a2..f885c57e78 100644
--- a/src/tests/end2end/VertexFormatTests.cpp
+++ b/src/tests/end2end/VertexFormatTests.cpp
@@ -692,6 +692,9 @@ TEST_P(VertexFormatTest, Float16x2) {
     // Fails on NVIDIA's Vulkan drivers on CQ but passes locally.
     DAWN_SUPPRESS_TEST_IF(IsVulkan() && IsNvidia());
 
+    // TODO(crbug.com/tint/904): FXC emits bad output for this test
+    DAWN_SUPPRESS_TEST_IF(IsD3D12() && !IsDXC());
+
     std::vector<uint16_t> vertexData =
         Float32ToFloat16(std::vector<float>({14.8f, -0.0f, 22.5f, 1.3f, +0.0f, -24.8f}));