diff --git a/pydash/services.py b/pydash/services.py
index f102742..3e470d4 100644
--- a/pydash/services.py
+++ b/pydash/services.py
@@ -211,7 +211,7 @@ def get_mem():
     """
     try:
         pipe = os.popen(
-            "free -tmo | " + "grep 'Mem' | " + "awk '{print $2,$4,$6,$7}'")
+            "free -tm | " + "grep 'Mem' | " + "awk '{print $2,$4,$6,$7}'")
         data = pipe.read().strip().split()
         pipe.close()