diff --git a/selfdrive/modeld/constants.py b/selfdrive/modeld/constants.py
index 46c52c8521..5ca0a86bc8 100644
--- a/selfdrive/modeld/constants.py
+++ b/selfdrive/modeld/constants.py
@@ -14,10 +14,14 @@ class ModelConstants:
 
   # model inputs constants
   MODEL_FREQ = 20
+  HISTORY_FREQ = 5
+  HISTORY_LEN_SECONDS = 5
+  TEMPORAL_SKIP = MODEL_FREQ // HISTORY_FREQ
+  FULL_HISTORY_BUFFER_LEN = MODEL_FREQ * HISTORY_LEN_SECONDS
+  INPUT_HISTORY_BUFFER_LEN = HISTORY_FREQ * HISTORY_LEN_SECONDS
+
   FEATURE_LEN = 512
-  TEMPORAL_SKIP = 4
-  FULL_HISTORY_BUFFER_LEN = MODEL_FREQ * 5
-  FULL_HISTORY_BUFFER_LEN_INPUT = FULL_HISTORY_BUFFER_LEN // TEMPORAL_SKIP
+
   DESIRE_LEN = 8
   TRAFFIC_CONVENTION_LEN = 2
   LAT_PLANNER_STATE_LEN = 4
diff --git a/selfdrive/modeld/modeld.py b/selfdrive/modeld/modeld.py
index 2bd63d8b9f..7c2be5fe98 100755
--- a/selfdrive/modeld/modeld.py
+++ b/selfdrive/modeld/modeld.py
@@ -62,15 +62,15 @@ class ModelState:
     self.full_features_buffer = np.zeros((1, ModelConstants.FULL_HISTORY_BUFFER_LEN,  ModelConstants.FEATURE_LEN), dtype=np.float32)
     self.full_desire = np.zeros((1, ModelConstants.FULL_HISTORY_BUFFER_LEN, ModelConstants.DESIRE_LEN), dtype=np.float32)
     self.full_prev_desired_curv = np.zeros((1, ModelConstants.FULL_HISTORY_BUFFER_LEN, ModelConstants.PREV_DESIRED_CURV_LEN), dtype=np.float32)
-    self.temporal_idxs = slice(-1-(ModelConstants.TEMPORAL_SKIP*(ModelConstants.FULL_HISTORY_BUFFER_LEN_INPUT-1)), None, ModelConstants.TEMPORAL_SKIP)
+    self.temporal_idxs = slice(-1-(ModelConstants.TEMPORAL_SKIP*(ModelConstants.INPUT_HISTORY_BUFFER_LEN-1)), None, ModelConstants.TEMPORAL_SKIP)
 
     # policy inputs
     self.numpy_inputs = {
-      'desire': np.zeros((1, ModelConstants.FULL_HISTORY_BUFFER_LEN_INPUT, ModelConstants.DESIRE_LEN), dtype=np.float32),
+      'desire': np.zeros((1, ModelConstants.INPUT_HISTORY_BUFFER_LEN, ModelConstants.DESIRE_LEN), dtype=np.float32),
       'traffic_convention': np.zeros((1, ModelConstants.TRAFFIC_CONVENTION_LEN), dtype=np.float32),
       'lateral_control_params': np.zeros((1, ModelConstants.LATERAL_CONTROL_PARAMS_LEN), dtype=np.float32),
-      'prev_desired_curv': np.zeros((1, ModelConstants.FULL_HISTORY_BUFFER_LEN_INPUT, ModelConstants.PREV_DESIRED_CURV_LEN), dtype=np.float32),
-      'features_buffer': np.zeros((1, ModelConstants.FULL_HISTORY_BUFFER_LEN_INPUT,  ModelConstants.FEATURE_LEN), dtype=np.float32),
+      'prev_desired_curv': np.zeros((1, ModelConstants.INPUT_HISTORY_BUFFER_LEN, ModelConstants.PREV_DESIRED_CURV_LEN), dtype=np.float32),
+      'features_buffer': np.zeros((1, ModelConstants.INPUT_HISTORY_BUFFER_LEN,  ModelConstants.FEATURE_LEN), dtype=np.float32),
     }
 
     with open(VISION_METADATA_PATH, 'rb') as f: