diff --git a/prose/core/image.py b/prose/core/image.py
index 699fce8..6e7c244 100644
--- a/prose/core/image.py
+++ b/prose/core/image.py
@@ -70,6 +70,10 @@ def __post_init__(self):
             self.catalogs = {}
         if self.computed is None:
             self.computed = {}
+
+        # backward compatibility
+        self.header = self.computed.get("fits_header", None)
+
         if self.header is None:
             self.header = Header()
         if isinstance(self._sources, dict):
@@ -261,7 +265,7 @@ def fov(self):
     @property
     def fits_header(self):
         """Same as :code:`header` (backward compatibility)"""
-        return self.header
+        return self.computed.get("fits_header", self.header)
 
     @property
     def date(self):
diff --git a/prose/core/source.py b/prose/core/source.py
index 692f30d..1487cec 100644
--- a/prose/core/source.py
+++ b/prose/core/source.py
@@ -501,10 +501,13 @@ class Sources:
     """List of sources"""
     type: Literal["PointSource", None] = None
     """Source type"""
+    source_type: Literal["PointSource", None] = None
+    """Legacy source type"""
 
     def __post_init__(self):
         if self.sources is None:
             self.sources = []
+            self.type = self.source_type
 
         if isinstance(self.sources, np.ndarray):
             if self.sources.dtype != object:
diff --git a/pyproject.toml b/pyproject.toml
index 0eda31a..52dacbc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "prose"
-version = "3.2.8"
+version = "3.2.9"
 description = "Modular image processing pipelines for Astronomy"
 authors = ["Lionel Garcia"]
 license = "MIT"