diff --git a/axelrod/data/all_classifiers.yml b/axelrod/data/all_classifiers.yml
index 32d004187..870322292 100644
--- a/axelrod/data/all_classifiers.yml
+++ b/axelrod/data/all_classifiers.yml
@@ -1087,7 +1087,8 @@ Mind Controller:
 Mind Reader:
   inspects_source: true
   long_run_time: false
-  makes_use_of: !!set {}
+  makes_use_of: !!set
+    game: null
   manipulates_source: false
   manipulates_state: false
   memory_depth: .inf
@@ -1295,7 +1296,8 @@ Prober 4:
 Protected Mind Reader:
   inspects_source: true
   long_run_time: false
-  makes_use_of: !!set {}
+  makes_use_of: !!set
+    game: null
   manipulates_source: true
   manipulates_state: false
   memory_depth: .inf
diff --git a/axelrod/strategies/mindreader.py b/axelrod/strategies/mindreader.py
index 723f503bf..dd6c64269 100644
--- a/axelrod/strategies/mindreader.py
+++ b/axelrod/strategies/mindreader.py
@@ -23,7 +23,7 @@ class MindReader(Player):
     classifier = {
         "memory_depth": float("inf"),
         "stochastic": False,
-        "makes_use_of": set(),
+        "makes_use_of": {"game"},
         "long_run_time": False,
         "inspects_source": True,  # Finds out what opponent will do
         "manipulates_source": False,
@@ -61,7 +61,7 @@ class ProtectedMindReader(MindReader):
     classifier = {
         "memory_depth": float("inf"),
         "stochastic": False,
-        "makes_use_of": set(),
+        "makes_use_of": {"game"},
         "long_run_time": False,
         "inspects_source": True,  # Finds out what opponent will do
         "manipulates_source": True,  # Stops opponent's strategy
diff --git a/axelrod/tests/strategies/test_mindreader.py b/axelrod/tests/strategies/test_mindreader.py
index ffd996022..21a78ec6a 100644
--- a/axelrod/tests/strategies/test_mindreader.py
+++ b/axelrod/tests/strategies/test_mindreader.py
@@ -15,7 +15,7 @@ class TestMindReader(TestPlayer):
     expected_classifier = {
         "memory_depth": float("inf"),
         "stochastic": False,
-        "makes_use_of": set(),
+        "makes_use_of": {"game"},
         "long_run_time": False,
         "inspects_source": True,
         "manipulates_source": False,
@@ -101,7 +101,7 @@ class TestProtectedMindReader(TestPlayer):
     expected_classifier = {
         "memory_depth": float("inf"),
         "stochastic": False,
-        "makes_use_of": set(),
+        "makes_use_of": {"game"},
         "long_run_time": False,
         "inspects_source": True,  # Finds out what opponent will do
         "manipulates_source": True,  # Stops opponent's strategy