diff --git a/src/toil_lib/tools/mutation_callers.py b/src/toil_lib/tools/mutation_callers.py
index 0a642b6..8c7c128 100644
--- a/src/toil_lib/tools/mutation_callers.py
+++ b/src/toil_lib/tools/mutation_callers.py
@@ -1,7 +1,7 @@
 import os
 from glob import glob
 
-from toil_scripts.tools import get_mean_insert_size
+from toil_lib.tools import get_mean_insert_size
 from toil_lib.files import tarball_files
 from toil_lib.programs import docker_call