diff --git a/lib/spack/spack/solver/asp.py b/lib/spack/spack/solver/asp.py
index ebf340e172d..d3f16f31f37 100644
--- a/lib/spack/spack/solver/asp.py
+++ b/lib/spack/spack/solver/asp.py
@@ -114,7 +114,9 @@ class Provenance(enum.IntEnum):
     # A 'package.py' file
     PACKAGE_PY = enum.auto()
     # An installed spec
-    INSTALLED = enum.auto()
+    INSTALLED_STANDARD_VERSION = enum.auto()
+    # lower provenance for installed git refs so concretizer prefers StandardVersion installs
+    INSTALLED_GIT_VERSION = enum.auto()
     # A runtime injected from another package (e.g. a compiler)
     RUNTIME = enum.auto()
 
@@ -1999,10 +2001,10 @@ 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 (not isinstance(version, vn.GitVersion) and any(
-                v == version
-                for v in self.possible_versions[s.name]
-            )):
+            if version is None or (
+                not isinstance(version, vn.GitVersion)
+                and any((v == version) for v in self.possible_versions[s.name])
+            ):
                 continue
 
             if require_checksum and not _is_checksummed_git_version(version):
@@ -2316,9 +2318,20 @@ def concrete_specs(self):
             # - Add OS to possible OS's
             for dep in spec.traverse():
                 self.possible_versions[dep.name].add(dep.version)
-                self.declared_versions[dep.name].append(
-                    DeclaredVersion(version=dep.version, idx=0, origin=Provenance.INSTALLED)
-                )
+                if isinstance(dep.version, vn.GitVersion):
+                    self.declared_versions[dep.name].append(
+                        DeclaredVersion(
+                            version=dep.version, idx=0, origin=Provenance.INSTALLED_GIT_VERSION
+                        )
+                    )
+                else:
+                    self.declared_versions[dep.name].append(
+                        DeclaredVersion(
+                            version=dep.version,
+                            idx=0,
+                            origin=Provenance.INSTALLED_STANDARD_VERSION,
+                        )
+                    )
                 self.possible_oses.add(dep.os)
 
     def define_concrete_input_specs(self, specs, possible):