diff --git a/findrpc.py b/findrpc.py
index 218100b..ec3c5dc 100644
--- a/findrpc.py
+++ b/findrpc.py
@@ -900,7 +900,7 @@ def _guess_column_width(self):
             sample_width = self._font_metrics.boundingRect(self._model.__class__.SAMPLE_CONTENTS[i]).width()
             header_width = self._font_metrics.boundingRect(self._model._column_headers[i]).width()
 
-            self._table.setColumnWidth(i, max(header_width, sample_width))
+            self._table.setColumnWidth(i, int(max(header_width, sample_width)))
 
     def _ui_entry_double_click(self, index):
         """
@@ -1244,7 +1244,7 @@ def _guess_column_width(self):
             sample_width = self._font_metrics.boundingRect(self._model.__class__.SAMPLE_CONTENTS[i]).width()
             header_width = self._font_metrics.boundingRect(self._model._column_headers[i]).width()
 
-            self._table.setColumnWidth(i, max(header_width, sample_width))
+            self._table.setColumnWidth(i, int(max(header_width, sample_width)))
 
 
     def _ui_ctx_menu_handler(self, position):