diff --git a/poetry/installation/chooser.py b/poetry/installation/chooser.py
index d48fa5e0522..d49a183d9f8 100644
--- a/poetry/installation/chooser.py
+++ b/poetry/installation/chooser.py
@@ -111,7 +111,7 @@ def _get_links(self, package):  # type: (Package) -> List[Link]
 
         if links and not selected_links:
             raise RuntimeError(
-                f"Retrieved digest for link {link.filename}({h}) not in poetry.lock metadata {hashes}"
+                "Retrieved digest for link {}({}) not in poetry.lock metadata {}".format(link.filename, h, hashes)
             )
 
         return selected_links