diff --git a/mx_proc.c b/mx_proc.c
index 00b37a6b..48e590cc 100644
--- a/mx_proc.c
+++ b/mx_proc.c
@@ -166,7 +166,6 @@ static void mx_proc_tree_update_parent_pinfo(struct mx_proc_tree_node *this, str
     if (!this)
         return;
 
-    this->pinfo.sum_rss += pinfo->sum_rss;
     this->pinfo.sum_rss_anon += pinfo->sum_rss_anon;
 
     mx_proc_tree_update_parent_pinfo(this->parent, pinfo);
@@ -269,7 +268,6 @@ static struct mx_proc_tree_node *mx_proc_tree_add(struct mx_proc_tree *pt, struc
     pt->nentries++;
 
     new->pinfo.pstat   = pps;
-    new->pinfo.sum_rss = pps->rss;
     new->pinfo.sum_rss_anon = pps->rss_anon;
 
     if (!(pt->root)) {
diff --git a/mx_proc.h b/mx_proc.h
index 428620df..2a125c66 100644
--- a/mx_proc.h
+++ b/mx_proc.h
@@ -6,7 +6,6 @@
 struct mx_proc_info {
     struct mx_proc_pid_stat *pstat;
 
-    unsigned long long int sum_rss;
     unsigned long long int sum_rss_anon;
 };