diff --git a/swash/processing/read_swash.py b/swash/processing/read_swash.py
index 9265db2..cc24b2c 100644
--- a/swash/processing/read_swash.py
+++ b/swash/processing/read_swash.py
@@ -24,7 +24,7 @@ class ReadSwash:
 
     def read_scalar(self, path, const=False):
         if const:
-            self._data[path.stem] = slef.read_nohead(path).reshape(
+            self._data[path.stem] = self.read_nohead(path).reshape(
                 (self._n_t, self._n_x)
             )[0, :]
         self._data[path.stem] = self.read_nohead(path).reshape(