diff --git a/blimpy/file_wrapper.py b/blimpy/file_wrapper.py
index 11581ba0..9378f765 100644
--- a/blimpy/file_wrapper.py
+++ b/blimpy/file_wrapper.py
@@ -646,7 +646,7 @@ def read_blob(self,blob_dim,n_blob=0):
         else:
             updated_blob_dim = blob_dim
 
-        blob_start = self._find_blob_start(blob_dim)
+        blob_start = self._find_blob_start()
         blob = np.zeros(updated_blob_dim,dtype=self._d_type)
 
         #EE: For now; also assuming one polarization and one beam.