diff --git a/src/quant_platform_kit/common/runtime_config.py b/src/quant_platform_kit/common/runtime_config.py
index f149fd5..3a2d0d3 100644
--- a/src/quant_platform_kit/common/runtime_config.py
+++ b/src/quant_platform_kit/common/runtime_config.py
@@ -65,6 +65,7 @@ def resolve_quantity_step_env(
     step_env: str,
     fractional_env: str,
     fractional_default: bool,
+    fractional_step: float = 0.0001,
 ) -> float:
     explicit_step = resolve_optional_float_env(env, step_env)
     if explicit_step is not None:
@@ -75,7 +76,7 @@ def resolve_quantity_step_env(
         if raw_enabled is None
         else resolve_bool_value(raw_enabled)
     )
-    return 0.000001 if fractional_enabled else 1.0
+    return float(fractional_step) if fractional_enabled else 1.0
 
 
 def resolve_strategy_config_path(
diff --git a/tests/test_runtime_config.py b/tests/test_runtime_config.py
index dea426f..ffc5557 100644
--- a/tests/test_runtime_config.py
+++ b/tests/test_runtime_config.py
@@ -47,7 +47,17 @@ def test_common_runtime_config_helpers_normalize_basic_values(self) -> None:
                     fractional_env="FRACTIONAL_ENABLED",
                     fractional_default=False,
                 ),
-                0.000001,
+                0.0001,
+            )
+            self.assertEqual(
+                resolve_quantity_step_env(
+                    env,
+                    step_env="MISSING_STEP",
+                    fractional_env="FRACTIONAL_ENABLED",
+                    fractional_default=False,
+                    fractional_step=0.001,
+                ),
+                0.001,
             )
             self.assertEqual(
                 resolve_quantity_step_env(