diff --git a/python/pylibcudf/pylibcudf/io/parquet.pyx b/python/pylibcudf/pylibcudf/io/parquet.pyx
index 9cd3a20da66..3d5461f19d3 100644
--- a/python/pylibcudf/pylibcudf/io/parquet.pyx
+++ b/python/pylibcudf/pylibcudf/io/parquet.pyx
@@ -383,7 +383,7 @@ cdef class ParquetWriterOptions:
         -------
         None
         """
-        self.c_obj.set_max_dictionary_size(size_rows)
+        self.c_obj.set_max_dictionary_size(size_bytes)
 
 
 cdef class ParquetWriterOptionsBuilder: