diff --git a/onnxruntime/core/providers/webgpu/math/softmax.cc b/onnxruntime/core/providers/webgpu/math/softmax.cc
index 4685d8eef0..4541b7a65a 100644
--- a/onnxruntime/core/providers/webgpu/math/softmax.cc
+++ b/onnxruntime/core/providers/webgpu/math/softmax.cc
@@ -81,7 +81,7 @@ Status SoftmaxProgram::GenerateShaderCode(ShaderHelper& shader) const {
   shader.AddOutput("result", ShaderUsage::UseUniform | ShaderUsage::UseIndicesTypeAlias);
   int components = input.NumComponents();
 
-  std::string threadMaxDecl = is_fp32_ ? "var thread_max = x_value_t(-3.402823e+38f);\n" : "var thread_max = x_value_t(-65504.0h);\n";
+  const std::string threadMaxDecl = is_fp32_ ? "var thread_max = x_value_t(-3.402823e+38f);\n" : "var thread_max = x_value_t(-65504.0h);\n";
 
   // Define shared memory for row max and row sum
   shader.AdditionalImplementation()