diff --git a/osbuild/solver/dnf.py b/osbuild/solver/dnf.py
index 3c96f8d1e..f5231dc21 100755
--- a/osbuild/solver/dnf.py
+++ b/osbuild/solver/dnf.py
@@ -306,6 +306,7 @@ def depsolve(self, arguments):
                 "sslclientcert": repo.sslclientcert,
             }
         response = {
+            "solver": "dnf",
             "packages": packages,
             "repos": repositories,
         }
diff --git a/osbuild/solver/dnf5.py b/osbuild/solver/dnf5.py
index 75c20cf14..01b0f7a0f 100755
--- a/osbuild/solver/dnf5.py
+++ b/osbuild/solver/dnf5.py
@@ -429,6 +429,7 @@ def depsolve(self, arguments):
                 "sslcacert": get_string_option(repo_cfg.get_sslcacert_option()),
             }
         response = {
+            "solver": "dnf5",
             "packages": packages,
             "repos": repositories,
         }
diff --git a/tools/test/test_depsolve.py b/tools/test/test_depsolve.py
index 1d2b3b462..23e7a4c03 100644
--- a/tools/test/test_depsolve.py
+++ b/tools/test/test_depsolve.py
@@ -302,3 +302,12 @@ def test_depsolve(tmp_path, repo_servers, dnf_config, detect_fn, test_case):
                 assert n_filelist_files == len(REPO_PATHS)
             else:
                 assert n_filelist_files == 0
+
+            if dnf_config:
+                use_dnf5 = json.loads(dnf_config)["use_dnf5"]
+            else:
+                use_dnf5 = False
+            if use_dnf5:
+                assert res["solver"] == "dnf5"
+            else:
+                assert res["solver"] == "dnf"