diff --git a/platformio/package/manifest/parser.py b/platformio/package/manifest/parser.py
index 6507849d..b4a93d98 100644
--- a/platformio/package/manifest/parser.py
+++ b/platformio/package/manifest/parser.py
@@ -422,6 +422,8 @@ class ModuleJsonManifestParser(BaseManifestParser):
             del data["licenses"]
         if "dependencies" in data:
             data["dependencies"] = self._parse_dependencies(data["dependencies"])
+        if "keywords" in data:
+            data["keywords"] = self.str_to_list(data["keywords"], sep=",")
         return data
 
     def _parse_authors(self, raw):
diff --git a/tests/package/test_manifest.py b/tests/package/test_manifest.py
index 188c5d8e..899f1cdf 100644
--- a/tests/package/test_manifest.py
+++ b/tests/package/test_manifest.py
@@ -172,7 +172,7 @@ def test_module_json_parser():
             "name": "YottaLibrary",
             "description": "This is Yotta library",
             "homepage": "https://yottabuild.org",
-            "keywords": ["mbed", "Yotta"],
+            "keywords": ["mbed", "yotta"],
             "license": "Apache-2.0",
             "platforms": ["*"],
             "frameworks": ["mbed"],