diff --git a/lib/spack/spack/repo.py b/lib/spack/spack/repo.py
index dba5b0c337a..0b61c913cc3 100644
--- a/lib/spack/spack/repo.py
+++ b/lib/spack/spack/repo.py
@@ -1472,10 +1472,6 @@ class UnknownEntityError(RepoError):
     """Raised when we encounter a package spack doesn't have."""
 
 
-class IndexError(RepoError):
-    """Raised when there's an error with an index."""
-
-
 class UnknownPackageError(UnknownEntityError):
     """Raised when we encounter a package spack doesn't have."""