diff --git a/apps/common/utils.py b/apps/common/utils.py
index 9af801c1c..733f91a18 100644
--- a/apps/common/utils.py
+++ b/apps/common/utils.py
@@ -327,6 +327,10 @@ def capacity_convert(size, expect='auto', rate=1000):
             if rate > std_size/rate_ > 1:
                 expect = unit
                 break
+
+    if expect not in rate_mapping:
+        expect = 'K'
+
     expect_size = std_size / rate_mapping[expect]
     return expect_size, expect
 
diff --git a/requirements/mac_requirements.txt b/requirements/mac_requirements.txt
index 8d00d7608..c7accda00 100644
--- a/requirements/mac_requirements.txt
+++ b/requirements/mac_requirements.txt
@@ -1 +1 @@
-openssl  brew install libtiff libjpeg webp little-cms2
+brew install libtiff libjpeg webp little-cms2 openssl