diff --git a/intelmq/bots/experts/sieve/expert.py b/intelmq/bots/experts/sieve/expert.py
index 995c2689a5..942d4cccee 100644
--- a/intelmq/bots/experts/sieve/expert.py
+++ b/intelmq/bots/experts/sieve/expert.py
@@ -537,6 +537,11 @@ def validate_numeric_match(num_match) -> None:
             if type not in valid_types:
                 raise TextXSemanticError(f"Incompatible type: {type}.", **position)
         except KeyError:
+            if any(
+                num_match.key.startswith(f"{key}.") and value["type"] == "JSONDict"
+                for key, value in SieveExpertBot._harmonization.items()
+            ):
+                return
             raise TextXSemanticError(f"Invalid key: {num_match.key}.", **position)
 
     @staticmethod
diff --git a/intelmq/tests/bots/experts/sieve/test_expert.py b/intelmq/tests/bots/experts/sieve/test_expert.py
index 20023b4137..875cbf8142 100644
--- a/intelmq/tests/bots/experts/sieve/test_expert.py
+++ b/intelmq/tests/bots/experts/sieve/test_expert.py
@@ -585,6 +585,21 @@ def test_numeric_invalid_key(self):
         exception = context.exception
         self.assertRegex(str(exception), r".*Incompatible type: FQDN\.$")
 
+    def test_numeric_extra_jsondict_match(self):
+        """Test numeric match for dynamic extra.* fields."""
+        self.sysconfig["file"] = os.path.join(
+            os.path.dirname(__file__),
+            "test_sieve_files/test_numeric_extra_jsondict.sieve",
+        )
+
+        event = EXAMPLE_INPUT.copy()
+        event["extra.min_amplification"] = 6
+        expected = event.copy()
+        expected["comment"] = "matched extra numeric field"
+        self.input_message = event
+        self.run_bot()
+        self.assertMessageEqual(0, expected)
+
     def test_exists_match(self):
         """Test :exists match"""
         self.sysconfig["file"] = os.path.join(
diff --git a/intelmq/tests/bots/experts/sieve/test_sieve_files/test_numeric_extra_jsondict.sieve b/intelmq/tests/bots/experts/sieve/test_sieve_files/test_numeric_extra_jsondict.sieve
new file mode 100644
index 0000000000..0ef7abc8f7
--- /dev/null
+++ b/intelmq/tests/bots/experts/sieve/test_sieve_files/test_numeric_extra_jsondict.sieve
@@ -0,0 +1,3 @@
+if extra.min_amplification > 5 {
+    add comment = "matched extra numeric field"
+}