diff --git a/isic_cli/cli/types.py b/isic_cli/cli/types.py
index 927283a..b15befa 100644
--- a/isic_cli/cli/types.py
+++ b/isic_cli/cli/types.py
@@ -13,6 +13,8 @@ class SearchString(click.ParamType):
     name = "search_string"
 
     def convert(self, value, param, ctx):
+        value = super().convert(value, param, ctx)
+
         r = ctx.obj.session.get("images/search/", params={"query": value, "limit": 1})
         if r.status_code == 400 and "detail" in r.json() and "query" in r.json()["detail"]:
             self.fail('Invalid search query string "%s"' % value, param, ctx)
@@ -23,6 +25,8 @@ class CommaSeparatedIdentifiers(click.ParamType):
     name = "comma_separated_identifiers"
 
     def convert(self, value, param, ctx):
+        value = super().convert(value, param, ctx)
+
         if value != "" and not re.match(r"^(\d+)(,\d+)*$", value):
             self.fail('Improperly formatted value "%s".' % value, param, ctx)
         return value
@@ -36,6 +40,8 @@ def __init__(self, locked_okay: Optional[bool] = False) -> None:
         self.locked_okay = locked_okay
 
     def convert(self, value: str, param, ctx) -> str:
+        value = super().convert(value, param, ctx)
+
         try:
             collection = get_collection(ctx.obj.session, value)
         except HTTPError as e:
@@ -57,6 +63,8 @@ class CohortId(IntParamType):
     name = "cohort_id"
 
     def convert(self, value: str, param, ctx) -> str:
+        value = super().convert(value, param, ctx)
+
         try:
             get_cohort(ctx.obj.session, value)
         except HTTPError as e:
diff --git a/tests/test_cli_collection.py b/tests/test_cli_collection.py
index 66be944..389d41e 100644
--- a/tests/test_cli_collection.py
+++ b/tests/test_cli_collection.py
@@ -43,6 +43,18 @@ def cmd(foo):
         assert "locked for modification" in result.output, result.output
 
 
+def test_collection_id_type_must_be_integer(mocker):
+    @click.command()
+    @click.argument("foo", type=CollectionId())
+    def cmd(foo):
+        pass
+
+    # magicmock is used to mock out ctx.obj
+    result = CliRunner().invoke(cmd, ["some-non-numeric-string"], obj=mocker.MagicMock())
+    assert result.exit_code == 2, result.exit_code
+    assert "is not a valid" in result.output, result.output
+
+
 def test_collection_id_type_access(mocker):
     @click.command()
     @click.argument("foo", type=CollectionId())