diff --git a/src/koopmans/aiida/setup/pseudos/_norm_conserving.py b/src/koopmans/aiida/setup/pseudos/_norm_conserving.py
index ed74a886..d06b981f 100644
--- a/src/koopmans/aiida/setup/pseudos/_norm_conserving.py
+++ b/src/koopmans/aiida/setup/pseudos/_norm_conserving.py
@@ -25,11 +25,12 @@ def get_content(self) -> str:
 
 
 # UPF ``pseudo_type`` values that are not norm-conserving. "NC" and "SL"
-# (semilocal) are; "1/r" is a bare Coulomb potential, which pw.x takes but the
-# Koopmans codes do not. "US" is what a v1 header carries, where there are no
-# flags to fall back on; "USPP" is PSlibrary's v2 spelling, and "1/r" is
-# carried against a header that names a type without flagging itself.
-_NOT_NORM_CONSERVING = {"US", "USPP", "PAW", "1/r"}
+# (semilocal) are; "US" is what a v1 header carries, where there are no
+# flags to fall back on; "USPP" is PSlibrary's v2 spelling. A bare Coulomb
+# potential ("1/r") passes: both kcp.x and kcw.x synthesise its local
+# potential and treat it like any local-only norm-conserving potential
+# (CPV/src/pseudopot_sub.f90, upflib/vloc_mod.f90).
+_NOT_NORM_CONSERVING = {"US", "USPP", "PAW"}
 
 # UPF v2 writes the header as XML attributes. Only the first 4 kB after the
 # tag is searched, which covers the longest real header and keeps a stray
diff --git a/tests/conftest.py b/tests/conftest.py
index 0a5934a9..44596f7d 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -18,6 +18,7 @@
     clear_database_after_test,
     code_without_mpi_flag,
     compiled_binaries,
+    fake_coulomb_family,
     fake_declared_nc_family,
     fake_paw_family,
     fake_pseudodojo_lda_family,
diff --git a/tests/fixtures.py b/tests/fixtures.py
index fd69fed3..9774ab78 100644
--- a/tests/fixtures.py
+++ b/tests/fixtures.py
@@ -781,6 +781,12 @@ def fake_ultrasoft_family(aiida_profile: Any) -> Any:
     return _install_fake_family("MyPseudos/ultrasoft", {"Si": 4.0}, cutoffs=True, pseudo_type="US")
 
 
+@pytest.fixture
+def fake_coulomb_family(aiida_profile: Any) -> Any:
+    """Install a self-built family whose Si pseudopotential is a bare Coulomb potential."""
+    return _install_fake_family("MyPseudos/coulomb", {"Si": 4.0}, cutoffs=True, pseudo_type="1/r")
+
+
 @pytest.fixture
 def fake_paw_family(aiida_profile: Any) -> Any:
     """Install a self-built family whose Si pseudopotential is PAW."""
diff --git a/tests/test_norm_conserving_families.py b/tests/test_norm_conserving_families.py
index fde3ce96..77d6e3b8 100644
--- a/tests/test_norm_conserving_families.py
+++ b/tests/test_norm_conserving_families.py
@@ -57,6 +57,17 @@ def test_an_ultrasoft_or_paw_family_is_refused(
         assert f"Si ({pseudo_type})" in message
         assert "workflow.pseudo_library" in message
 
+    def test_a_bare_coulomb_family_is_accepted(
+        self, aiida_profile_clean: Any, fake_coulomb_family: Any
+    ) -> None:
+        """A bare Coulomb potential ("1/r") passes the check.
+
+        kcp.x and kcw.x synthesise its local potential and treat it like a
+        local-only norm-conserving potential, so there is nothing to refuse.
+        """
+        _, pseudo_family, _ = _dispatch("MyPseudos/coulomb")
+        assert pseudo_family == "MyPseudos/coulomb"
+
     def test_a_family_declaring_itself_nc_is_accepted(
         self, aiida_profile_clean: Any, fake_declared_nc_family: Any
     ) -> None: