diff --git a/lib/spack/spack/solver/concretize.lp b/lib/spack/spack/solver/concretize.lp
index 95d74d27edd..01462590309 100644
--- a/lib/spack/spack/solver/concretize.lp
+++ b/lib/spack/spack/solver/concretize.lp
@@ -1205,7 +1205,7 @@ attr("node_flag_propagate", Package, FlagType, Flag, Source) :-
 
 attr("node_flag_possible_prop", Package, FlagType, Flag, Source) :-
   same_compiler(Parent, Package),
-  attr("node_flag_possible_prop", Parent, _, _, Source),
+  attr("node_flag_possible_prop", Parent, FlagType, _, Source),
   attr("node_flag", Source, FlagType, Flag),
   flag_type(FlagType).
 
diff --git a/lib/spack/spack/test/concretize.py b/lib/spack/spack/test/concretize.py
index 7ebdc1f3ae2..267cef61547 100644
--- a/lib/spack/spack/test/concretize.py
+++ b/lib/spack/spack/test/concretize.py
@@ -374,6 +374,16 @@ def test_concretize_propagate_compiler_flag_not_passed_to_dependent(self):
         assert spec.satisfies("^dyninst cflags='-O3'")
         assert spec.satisfies("^libelf cflags='-g'")
 
+    @pytest.mark.only_clingo(
+        "Optional compiler propagation isn't deprecated for original concretizer"
+    )
+    def test_concretize_propagate_specified_compiler_flag(self):
+        spec = Spec("callpath cflags=='-g' cxxflags='-O3'")
+        spec.concretize()
+
+        assert spec.satisfies("^dyninst cflags='-g'")
+        assert not spec.satisfies("^dyninst cxxflags='-O3'")
+
     def test_mixing_compilers_only_affects_subdag(self):
         spack.config.set("packages:all:compiler", ["clang", "gcc"])
         spec = Spec("dt-diamond%gcc ^dt-diamond-bottom%clang").concretized()