diff --git a/include/onnxruntime/core/session/onnxruntime_c_api.h b/include/onnxruntime/core/session/onnxruntime_c_api.h
index a4d5bd12be7f7..8a0d0c56d68f2 100644
--- a/include/onnxruntime/core/session/onnxruntime_c_api.h
+++ b/include/onnxruntime/core/session/onnxruntime_c_api.h
@@ -600,6 +600,7 @@ typedef struct OrtTensorRTProviderOptions {
 typedef struct OrtMIGraphXProviderOptions {
   int device_id;                                     // hip device id.
   int migraphx_fp16_enable;                          // MIGraphX FP16 precision. Default 0 = false, nonzero = true
+  int migraphx_fast_math_enable;                     // MIGraphX Fast Math Optimize. Default 0 = false, nonzero = true
   int migraphx_int8_enable;                          // MIGraphX INT8 precision. Default 0 = false, nonzero = true
   int migraphx_use_native_calibration_table;         // MIGraphx INT8 cal table. Default 0 = false, noznero = true
   const char* migraphx_int8_calibration_table_name;  // MIGraphx INT8 calibration table name
diff --git a/onnxruntime/core/providers/migraphx/migraphx_execution_provider.cc b/onnxruntime/core/providers/migraphx/migraphx_execution_provider.cc
index 4cb9a04c5aebf..4b7b1441a6563 100644
--- a/onnxruntime/core/providers/migraphx/migraphx_execution_provider.cc
+++ b/onnxruntime/core/providers/migraphx/migraphx_execution_provider.cc
@@ -115,8 +115,8 @@ MIGraphXExecutionProvider::MIGraphXExecutionProvider(const MIGraphXExecutionProv
   }
 
   // whether fp16 is enable
-  const std::string fast_math_enable_env = onnxruntime::GetEnvironmentVar(migraphx_env_vars::kFastMathOptimization);
-  if (!fast_math_env.empty()) {
+  const std::string fast_math_enable_env = onnxruntime::GetEnvironmentVar(migraphx_env_vars::kSetFastMathOptimization);
+  if (!fast_math_enable_env.empty()) {
     fast_math_enable_ = (std::stoi(fast_math_enable_env) == 0 ? false : true);
   }
 
@@ -1195,6 +1195,7 @@ Status MIGraphXExecutionProvider::Compile(const std::vector<FusedNodeAndGraph>&
       migraphx::onnx_options& cmp_options = mgx_state->options;
       bool& no_input_shape = mgx_state->no_input_shape;
       bool fp16_enable = mgx_state->fp16_enable;
+      bool fast_math_enable = mgx_state->fast_math_enable;
       bool int8_enable = mgx_state->int8_enable;
       bool int8_calibration_cache_available = mgx_state->int8_calibration_cache_available;