diff --git a/workflow/scripts/pool_and_psuedoreplicate.py b/workflow/scripts/pool_and_psuedoreplicate.py
index 2890ff2f8c81a144fe2687f9f963acd250317357..700070724499f2ab0a9625645853123cfb6ecf4c 100644
--- a/workflow/scripts/pool_and_psuedoreplicate.py
+++ b/workflow/scripts/pool_and_psuedoreplicate.py
@@ -247,7 +247,7 @@ def main():
             path_to_pool_control = cwd + '/' + pool_control
             if control_df.values.max() > 1.2:
                 logger.info("Number of reads in controls differ by " +
-                    " > factor of %f. Using pooled controls." % (cutoff_ratio))
+                    " > factor of %f. Using pooled controls." % (str(cutoff_ratio)))
                 design_new_df['control_tag_align'] = path_to_pool_control
             else:
                 for index, row in design_new_df.iterrows():