diff --git a/osx/par2/par2-sl64 b/osx/par2/par2-sl64
new file mode 100755
index 0000000..074216a
Binary files /dev/null and b/osx/par2/par2-sl64 differ
diff --git a/sabnzbd/__init__.py b/sabnzbd/__init__.py
index 63617ed..43c78d6 100644
--- a/sabnzbd/__init__.py
+++ b/sabnzbd/__init__.py
@@ -68,6 +68,7 @@ elif os.name == 'posix':
 if DARWIN:
     # 10 = Yosemite, 9 = Mavericks, 8 = MountainLion, 7 = Lion, 6 = SnowLeopard, 5 = Leopard
     DARWIN_VERSION = int(platform.mac_ver()[0].split('.')[1])
+    DARWIN_64 = platform.mac_ver()[2] == 'x86_64'
 else:
     DARWIN_VERSION = 0
 
diff --git a/sabnzbd/newsunpack.py b/sabnzbd/newsunpack.py
index f43f0c0..7f4f019 100644
--- a/sabnzbd/newsunpack.py
+++ b/sabnzbd/newsunpack.py
@@ -99,7 +99,10 @@ def find_programs(curdir):
         sabnzbd.newsunpack.PAR2C_COMMAND = check(curdir, 'osx/par2/par2-classic')
         if sabnzbd.DARWIN_VERSION >= 6:
             #par2-sl from Macpar Deluxe 4.1 is only 10.6 and later
-            sabnzbd.newsunpack.PAR2_COMMAND = check(curdir, 'osx/par2/par2-sl')
+            if sabnzbd.DARWIN_64:
+                sabnzbd.newsunpack.PAR2_COMMAND = check(curdir, 'osx/par2/par2-sl64')
+            else:
+                sabnzbd.newsunpack.PAR2_COMMAND = check(curdir, 'osx/par2/par2-sl')
         else:
             sabnzbd.newsunpack.PAR2_COMMAND = sabnzbd.newsunpack.PAR2C_COMMAND