diff --git a/src/_py/panel.rs b/src/_py/panel.rs
index 493a933..575d8dd 100644
--- a/src/_py/panel.rs
+++ b/src/_py/panel.rs
@@ -68,7 +68,7 @@ pub fn get_period_indices_hv(dfw: PyDataFrame, est_freq: &str) -> PyResult<Vec<u
     cids,
     weights = None,
     signs = None,
-    weight_xcats = None,
+    weight_xcat = None,
     normalize_weights = false,
     start = None,
     end = None,
@@ -84,7 +84,7 @@ pub fn linear_composite(
     cids: Vec<String>,
     weights: Option<Vec<f64>>,
     signs: Option<Vec<f64>>,
-    weight_xcats: Option<Vec<String>>,
+    weight_xcat: Option<String>,
     normalize_weights: bool,
     start: Option<String>,
     end: Option<String>,
@@ -101,7 +101,7 @@ pub fn linear_composite(
             cids,
             weights,
             signs,
-            weight_xcats,
+            weight_xcat,
             normalize_weights,
             start,
             end,