diff --git a/rompy/settings.py b/rompy/settings.py
index 5c484b5e..02479d6e 100644
--- a/rompy/settings.py
+++ b/rompy/settings.py
@@ -5,11 +5,11 @@
 # working in a python environement
 DATA_SOURCE_TYPES = os.getenv(
     "DATA_SOURCE_TYPES",
-    "SourceDataset:rompy.core.data,SourceFile:rompy.core.data,SourceIntake:rompy.core.data,SourceDatamesh:rompy.core.data",
+    "rompy.core.data.SourceDataset,rompy.core.data.SourceFile,rompy.core.data.SourceIntake,rompy.core.data.SourceDatamesh",
 )
 
 BOUNDARY_SOURCE_TYPES = os.getenv("BOUNDARY_SOURCE_TYPES", DATA_SOURCE_TYPES)
 SPEC_BOUNDARY_SOURCE_TYPES = os.getenv(
     "SPEC_BOUNDARY_SOURCE_TYPES",
-    DATA_SOURCE_TYPES + ",SourceWavespectra:rompy.core.boundary",
+    DATA_SOURCE_TYPES + ",rompy.core.boundary.SourceWavespectra",
 )
diff --git a/rompy/utils.py b/rompy/utils.py
index f16c6875..38145a37 100644
--- a/rompy/utils.py
+++ b/rompy/utils.py
@@ -287,7 +287,8 @@ def process_setting(settings_str: str):
     # Get the actual model classes
     data_source_types = []
     for data_source_type_name in data_source_type_names:
-        class_name, module_name = data_source_type_name.split(":")
+        split = data_source_type_name.split(".")
+        module_name, class_name = ".".join(split[:-1]), split[-1]
         data_source_types.append(get_class_from_module(module_name, class_name))
 
     # Filter out any None values (in case of invalid model names)