diff --git a/libbeat/scripts/generate_fields_docs.py b/libbeat/scripts/generate_fields_docs.py
index d3381af4dd6c..001896baf075 100644
--- a/libbeat/scripts/generate_fields_docs.py
+++ b/libbeat/scripts/generate_fields_docs.py
@@ -1,6 +1,8 @@
-import yaml
-import os
 import argparse
+from collections import OrderedDict
+import os
+
+import yaml
 
 
 def document_fields(output, section, sections, path):
@@ -102,6 +104,19 @@ def fields_to_asciidoc(input, output, beat):
         print("fields.yml file is empty. fields.asciidoc cannot be generated.")
         return
 
+    # deduplicate fields, last one wins
+    for section in docs:
+        fields = OrderedDict()
+        for field in section["fields"]:
+            name = field["name"]
+            if name in fields:
+                assert field["type"] == fields[name]["type"], 'field "{}" redefined with different type "{}"'.format(
+                    name, field["type"])
+                fields[name].update(field)
+            else:
+                fields[name] = field
+        section["fields"] = list(fields.values())
+
     # Create sections from available fields
     sections = {}
     for v in docs: