diff --git a/platformio/package/manifest/parser.py b/platformio/package/manifest/parser.py
index f317b0a3..4be71944 100644
--- a/platformio/package/manifest/parser.py
+++ b/platformio/package/manifest/parser.py
@@ -557,7 +557,7 @@ class LibraryPropertiesManifestParser(BaseManifestParser):
                 continue
             if arch == "*":
                 return ["*"]
-            if arch in platforms_map:
+            if arch in platforms_map and platforms_map[arch] not in result:
                 result.append(platforms_map[arch])
         return result
 
diff --git a/tests/package/test_manifest.py b/tests/package/test_manifest.py
index e75868e1..94dd29f1 100644
--- a/tests/package/test_manifest.py
+++ b/tests/package/test_manifest.py
@@ -440,7 +440,7 @@ sentence=A library for monochrome TFTs and OLEDs
 paragraph=Supported display controller: SSD1306, SSD1309, SSD1322, SSD1325
 category=Display
 url=https://github.com/olikraus/u8glib
-architectures=avr,sam
+architectures=avr,sam,samd
 depends=First Library (=2.0.0), Second Library (>=1.2.0), Third
 """
     raw_data = parser.ManifestParserFactory.new(