diff --git a/suit_generator/suit/manifest.py b/suit_generator/suit/manifest.py
index 0750fe1..61868c6 100644
--- a/suit_generator/suit/manifest.py
+++ b/suit_generator/suit/manifest.py
@@ -278,6 +278,12 @@ class SuitParameterInvokeArgs(SuitKeyValue):
     )
 
 
+class SuitParameterContent(SuitUnion):
+    """Abstract element to define possible sub-elements."""
+
+    _metadata = Metadata(children=[cbstr(SuitUint), SuitBstr])
+
+
 class SuitParameters(SuitKeyValue):
     """Representation of SUIT parameters."""
 
@@ -290,7 +296,7 @@ class SuitParameters(SuitKeyValue):
             suit_parameter_strict_order: SuitBool,
             suit_parameter_soft_failure: SuitBool,
             suit_parameter_image_size: SuitImageSize,
-            suit_parameter_content: SuitBstr,
+            suit_parameter_content: SuitParameterContent,
             suit_parameter_encryption_info: SuitEncryptionInfo,
             suit_parameter_uri: SuitTstr,
             suit_parameter_source_component: SuitUint,