diff --git a/src/dawn/tests/DawnTest.cpp b/src/dawn/tests/DawnTest.cpp
index ff72d3482c..8dc4d5d3b3 100644
--- a/src/dawn/tests/DawnTest.cpp
+++ b/src/dawn/tests/DawnTest.cpp
@@ -1095,7 +1095,7 @@ std::ostringstream& DawnTestBase::ExpectSampledFloatDataImpl(wgpu::TextureView t
                                                              uint32_t sampleCount,
                                                              detail::Expectation* expectation) {
     std::ostringstream shaderSource;
-    shaderSource << "let width : u32 = " << width << "u;\n";
+    shaderSource << "const width : u32 = " << width << "u;\n";
     shaderSource << "@group(0) @binding(0) var tex : " << wgslTextureType << ";\n";
     shaderSource << R"(
         struct Result {
@@ -1103,8 +1103,8 @@ std::ostringstream& DawnTestBase::ExpectSampledFloatDataImpl(wgpu::TextureView t
         }
         @group(0) @binding(1) var<storage, read_write> result : Result;
     )";
-    shaderSource << "let componentCount : u32 = " << componentCount << "u;\n";
-    shaderSource << "let sampleCount : u32 = " << sampleCount << "u;\n";
+    shaderSource << "const componentCount : u32 = " << componentCount << "u;\n";
+    shaderSource << "const sampleCount : u32 = " << sampleCount << "u;\n";
 
     shaderSource << "fn doTextureLoad(t: " << wgslTextureType
                  << ", coord: vec2<i32>, sample: u32, component: u32) -> f32";
diff --git a/src/dawn/tests/end2end/ComputeSharedMemoryTests.cpp b/src/dawn/tests/end2end/ComputeSharedMemoryTests.cpp
index c63e762285..94822df06f 100644
--- a/src/dawn/tests/end2end/ComputeSharedMemoryTests.cpp
+++ b/src/dawn/tests/end2end/ComputeSharedMemoryTests.cpp
@@ -71,8 +71,8 @@ void ComputeSharedMemoryTests::BasicTest(const char* shader) {
 // Basic shared memory test
 TEST_P(ComputeSharedMemoryTests, Basic) {
     BasicTest(R"(
-        let kTileSize : u32 = 4u;
-        let kInstances : u32 = 11u;
+        const kTileSize : u32 = 4u;
+        const kInstances : u32 = 11u;
 
         struct Dst {
             x : u32
diff --git a/src/dawn/tests/end2end/DynamicBufferOffsetTests.cpp b/src/dawn/tests/end2end/DynamicBufferOffsetTests.cpp
index 61caf90608..91332c6708 100644
--- a/src/dawn/tests/end2end/DynamicBufferOffsetTests.cpp
+++ b/src/dawn/tests/end2end/DynamicBufferOffsetTests.cpp
@@ -133,7 +133,7 @@ class DynamicBufferOffsetTests : public DawnTest {
             )";
         }
 
-        fs << "let multipleNumber : u32 = " << multipleNumber << "u;\n";
+        fs << "const multipleNumber : u32 = " << multipleNumber << "u;\n";
         fs << R"(
             @fragment fn main() -> @location(0) vec4<f32> {
                 sBufferNotDynamic.value = uBufferNotDynamic.value.xy;
@@ -183,7 +183,7 @@ class DynamicBufferOffsetTests : public DawnTest {
             )";
         }
 
-        cs << "let multipleNumber : u32 = " << multipleNumber << "u;\n";
+        cs << "const multipleNumber : u32 = " << multipleNumber << "u;\n";
         cs << R"(
             @compute @workgroup_size(1) fn main() {
                 sBufferNotDynamic.value = uBufferNotDynamic.value.xy;