diff --git a/Catalog/C3Catalog.py b/Catalog/C3Catalog.py
index f12436cf1f2cb50d8ac263322cd7be2089eb21a6..f28a1930780d2de83a3509a6ed8718557beba647 100644
--- a/Catalog/C3Catalog.py
+++ b/Catalog/C3Catalog.py
@@ -15,7 +15,7 @@ from ObservationSim.MockObject._util import seds, sed_assign, extAv, tag_sed, ge
 NSIDE = 128
 
 class C3Catalog(CatalogBase):
-    def __init__(self, config, **kwargs):
+    def __init__(self, config, chip, **kwargs):
         super().__init__()
         self.cat_dir = os.path.join(config["data_dir"], config["input_path"]["cat_dir"])
         self.seed_Av = config["random_seeds"]["seed_Av"]
@@ -24,10 +24,7 @@ class C3Catalog(CatalogBase):
         self.normF_star = Table.read(os.path.join(self.normalize_dir, 'SLOAN_SDSS.g.fits'))
         self.normF_galaxy = Table.read(os.path.join(self.normalize_dir, 'lsst_throuput_g.fits'))
         
-        try:
-            self.chip = kwargs["chip"]
-        except:
-            raise ValueError('For Cycle-3 Catalog class, must give a "chip" object to initiate')
+        self.chip = chip
 
         if "star_cat" in config["input_path"] and config["input_path"]["star_cat"]:
             star_file = config["input_path"]["star_cat"]
diff --git a/Catalog/Catalog_example.py b/Catalog/Catalog_example.py
index c8af865d4e43f2344a99d6f34a8771929d96bf28..d884f35991f03230e6dab974a02cc69b67a55e31 100644
--- a/Catalog/Catalog_example.py
+++ b/Catalog/Catalog_example.py
@@ -33,7 +33,7 @@ class Catalog_example(CatalogBase):
         load the filter throughput for the input catalog's photometric system.
     """
 
-    def __init__(self, config, **kwargs):
+    def __init__(self, config, chip, **kwargs):
         """Constructor method.
         
         Parameters
@@ -51,6 +51,7 @@ class Catalog_example(CatalogBase):
         
         super().__init__()
         self.cat_dir = os.path.join(config["data_dir"], config["input_path"]["cat_dir"])
+        self.chip = chip
         if "star_cat" in config["input_path"] and config["input_path"]["star_cat"]:
             star_file = config["input_path"]["star_cat"]
             star_SED_file = config["SED_templates_path"]["star_SED"]