diff --git a/software/source/server/services/tts/piper/tts.py b/software/source/server/services/tts/piper/tts.py
index c7e65b0..85dfd82 100644
--- a/software/source/server/services/tts/piper/tts.py
+++ b/software/source/server/services/tts/piper/tts.py
@@ -36,9 +36,9 @@ class Tts:
             os.makedirs(PIPER_FOLDER_PATH, exist_ok=True)
 
             # Determine OS and architecture
-            OS = platform.system()
+            OS = platform.system().lower()
             ARCH = platform.machine()
-            if OS == "Darwin":
+            if OS == "darwin":
                 OS = "macos"
                 if ARCH == "arm64":
                     ARCH = "aarch64"
@@ -47,7 +47,7 @@ class Tts:
                 else:
                     print("Piper: unsupported architecture")
                     return
-            elif OS == "Windows":
+            elif OS == "windows":
                 if ARCH == "AMD64":
                     ARCH = "amd64"
                 else:
@@ -58,7 +58,9 @@ class Tts:
             PIPER_URL = "https://github.com/rhasspy/piper/releases/latest/download/"
 
             asset_url = f"{PIPER_URL}{PIPER_ASSETNAME}"
-            if OS == "Windows":
+
+            if OS == "windows":
+
                 asset_url = asset_url.replace(".tar.gz", ".zip")
 
             # Download and extract Piper