diff --git a/lib/spack/spack/solver/asp.py b/lib/spack/spack/solver/asp.py
index 2b86200a309..db9c2ec42e9 100644
--- a/lib/spack/spack/solver/asp.py
+++ b/lib/spack/spack/solver/asp.py
@@ -2000,7 +2000,7 @@ def define_ad_hoc_versions_from_specs(
             # best possible, so they're guaranteed to be used preferentially.
             version = s.versions.concrete
 
-            if version is None or any(v == version for v in self.possible_versions[s.name]):
+            if version is None or any((v == version and not isinstance(version, vn.GitVersion)) for v in self.possible_versions[s.name]):
                 continue
 
             if require_checksum and not _is_checksummed_git_version(version):