diff --git a/src/pf1e_simulator/conditions.py b/src/pf1e_simulator/conditions.py
index 233a33a..de5f99e 100644
--- a/src/pf1e_simulator/conditions.py
+++ b/src/pf1e_simulator/conditions.py
@@ -99,12 +99,15 @@ SICKENED = Condition(
 )
 
 # Fatigued: -2 STR, -2 DEX; can't run or charge (CRB)
-# Approximation: -1 attack (STR/DEX), -1 damage (STR)
+# Approximation: -1 attack, -1 damage (STR/DEX), -1 AC and -1 Ref (the -2 DEX
+# = -1 to each, same modelling as exhausted/entangled).
 FATIGUED = Condition(
     name="fatigued",
     modifiers=(
         StatModifier(target="attack", value=-1),
         StatModifier(target="damage", value=-1),
+        StatModifier(target="ac", value=-1),
+        StatModifier(target="ref", value=-1),
     ),
     cant_charge=True,
 )
diff --git a/tests/test_conditions.py b/tests/test_conditions.py
index c1175c7..e18501a 100644
--- a/tests/test_conditions.py
+++ b/tests/test_conditions.py
@@ -138,6 +138,14 @@ class TestConditionData:
     def test_fatigued_flags(self) -> None:
         assert FATIGUED.cant_charge is True
 
+    def test_fatigued_minus2_dex_gives_minus1_ac_and_ref(self) -> None:
+        # SRD: fatigued takes -2 to Dexterity => -1 AC and -1 Reflex.
+        mods = {m.target: m.value for m in FATIGUED.modifiers}
+        assert mods["attack"] == -1
+        assert mods["damage"] == -1
+        assert mods["ac"] == -1
+        assert mods["ref"] == -1
+
     def test_flat_footed_flags(self) -> None:
         assert FLAT_FOOTED.denies_dex_to_ac is True
         assert FLAT_FOOTED.cant_aoo is True