diff --git a/manager/manager_utils.py b/manager/manager_utils.py
index 8f4cd270..e5168d86 100644
--- a/manager/manager_utils.py
+++ b/manager/manager_utils.py
@@ -33,7 +33,7 @@ def repl(match):
     return spack_path_resolve(path, default_wd=default_wd)
 
 
-def pruned_spec_string(spec, variants_to_omit=["dev_path=", "patches=", "build_system="]):
+def pruned_spec_string(spec, variants_to_omit=["ipo", "dev_path=", "patches=", "build_system="]):
     full_spec = spec.format("{name}{@version}{%compiler}{variants}{arch=architecture}")
 
     # add spaces between variants so we can filter