diff --git a/centreon-plugins/snmp_standard/mode/memory.pm b/centreon-plugins/snmp_standard/mode/memory.pm
index 8ae78c52c..8ebe67bb0 100644
--- a/centreon-plugins/snmp_standard/mode/memory.pm
+++ b/centreon-plugins/snmp_standard/mode/memory.pm
@@ -156,6 +156,7 @@ sub new {
         'units:s'   => { name => 'units', default => '%' },
         'free'      => { name => 'free' },
         'swap'      => { name => 'check_swap' },
+        'redhat'    => { name => 'redhat' },
     });
     
     return $self;
@@ -208,8 +209,54 @@ sub memory_calc {
     my ($used, $free, $prct_used, $prct_free) = (0, 0, 0, 0);
 
     if ($total != 0) {
-        $used = $total - $available - $buffer - $cached;
-        $free = $total - $used;
+        #### procps-ng-3.3.10-23
+        ## Mem:
+        ## total = MemTotal in /proc/meminfo
+        ## used = total - free - buffer - cache
+        ## free = MemFree in /proc/meminfo
+        ## shared = Shmem in /proc/meminfo
+        ## buffers = Buffers in /proc/meminfo
+        ## cache = Cached and Slab in /proc/meminfo
+        ## available = MemAvailable in /proc/meminfo
+        ## Swap:
+        ## total = SwapTotal in /proc/meminfo
+        ## used = total - free
+        ## free = SwapFree in /proc/meminfo
+        #### net-snmp-5.7.2-38
+        ## memTotalSwap = SwapTotal in /proc/meminfo
+        ## memAvailSwap = SwapFree in /proc/meminfo
+        ## memTotalReal = MemTotal in /proc/meminfo
+        ## memAvailReal = MemFree in /proc/meminfo
+        ## memTotalFree = memAvailSwap + memAvailReal
+        ## memShared = MemShared in /proc/meminfo
+        ## memBuffer = Buffers in /proc/meminfo
+        ## memCached = Cached in /proc/meminfo (missing Slab)
+
+        #### procps-ng-3.3.10-26
+        ## Mem:
+        ## total = MemTotal in /proc/meminfo
+        ## used = total - free - buffer - cache
+        ## free = MemFree in /proc/meminfo
+        ## shared = Shmem in /proc/meminfo
+        ## buffers = Buffers in /proc/meminfo
+        ## cache = Cached and SReclaimable in /proc/meminfo (https://gitlab.com/procps-ng/procps/commit/05d751c4f076a2f0118b914c5e51cfbb4762ad8e)
+        ## available = MemAvailable in /proc/meminfo
+        ## Swap:
+        ## total = SwapTotal in /proc/meminfo
+        ## used = total - free
+        ## free = SwapFree in /proc/meminfo
+        #### net-snmp-5.7.2-43
+        ## memTotalSwap = SwapTotal in /proc/meminfo
+        ## memAvailSwap = SwapFree in /proc/meminfo
+        ## memTotalReal = MemTotal in /proc/meminfo
+        ## memAvailReal = MemFree + Buffers + Cached + SReclaimable in /proc/meminfo (https://bugzilla.redhat.com/attachment.cgi?id=1554747&action=diff)
+        ## memTotalFree = memAvailSwap + memAvailReal
+        ## memShared = MemShared in /proc/meminfo
+        ## memBuffer = Buffers in /proc/meminfo
+        ## memCached = Cached + SReclaimable in /proc/meminfo (https://bugzilla.redhat.com/attachment.cgi?id=1554747&action=diff)
+        
+        $used = (defined($self->{option_results}->{redhat})) ? $total - $available : $total - $available - $buffer - $cached;
+        $free = (defined($self->{option_results}->{redhat})) ? $available : $total - $used;
         $prct_used = $used * 100 / $total;
         $prct_free = 100 - $prct_used;
     }
@@ -289,6 +336,16 @@ Can be: 'usage' (B), 'usage-free' (B), 'usage-prct' (%),
 'swap' (B), 'swap-free' (B), 'swap-prct' (%),
 'buffer' (B), 'cached' (B), 'shared' (B).
 
+=item B<--redhat>
+
+If using RedHat distribution with net-snmp >= 5.7.2-43.
+
+This version: used = memTotalReal - memAvailReal // free = memAvailReal
+
+Others versions: used = memTotalReal - memAvailReal - memBuffer - memCached // free = total - used
+
+(grep for '##' in this mode for more informations)
+
 =back
 
 =cut