diff --git a/nohang b/nohang
index 58433b5..6a1972d 100755
--- a/nohang
+++ b/nohang
@@ -611,7 +611,7 @@ def pid_to_status(pid):
 
             for n, line in enumerate(f):
 
-                if n is 0:
+                if n == 0:
                     name = line.split('\t')[1][:-1]
 
                 if n is state_index:
@@ -663,7 +663,7 @@ def pid_to_status_unicode(pid):
 
             for i in range(len(f_list)):
 
-                if i is 0:
+                if i == 0:
                     name = f_list[i].split('\t')[1]
 
                 if i is state_index:
@@ -793,7 +793,7 @@ def check_mem_and_swap():
     """find mem_available, swap_total, swap_free"""
     with open('/proc/meminfo') as f:
         for n, line in enumerate(f):
-            if n is 2:
+            if n == 2:
                 mem_available = int(line.split(':')[1][:-4])
                 continue
             if n is swap_total_index:
diff --git a/nohang.service.in b/nohang.service.in
index 1e16c27..be09fd3 100644
--- a/nohang.service.in
+++ b/nohang.service.in
@@ -9,6 +9,7 @@ KillMode=mixed
 OOMPolicy=continue
 Nice=-15
 CPUSchedulingResetOnFork=true
+MemoryMin=50%
 
 [Install]
 WantedBy=multi-user.target
diff --git a/oom-sort b/oom-sort
index 3e9ffb1..ac9c8d9 100755
--- a/oom-sort
+++ b/oom-sort
@@ -42,7 +42,7 @@ def pid_to_status_units(pid):
 
         for i in range(len(f_list)):
 
-            if i is 1:
+            if i == 1:
                 name = f_list[0].split('\t')[1]
 
             if i == uid_index: