diff --git a/applets/pbot-vm/host/lib/Languages/c2x.pm b/applets/pbot-vm/host/lib/Languages/c2x.pm
index 52cb4c59..b1cba1c8 100755
--- a/applets/pbot-vm/host/lib/Languages/c2x.pm
+++ b/applets/pbot-vm/host/lib/Languages/c2x.pm
@@ -14,7 +14,7 @@ sub initialize {
 
   $self->{sourcefile}      = 'prog.c';
   $self->{execfile}        = 'prog';
-  $self->{default_options} = '-Wextra -Wall -Wno-unused-parameter -Wno-unused-variable -pedantic -Wfloat-equal -Wshadow -std=c2x -lm -Wfatal-errors -fsanitize=alignment,undefined -fsanitize-address-use-after-scope -fno-omit-frame-pointer';
+  $self->{default_options} = '-Wextra -Wall -Wno-unused-parameter -Wno-unused-variable -pedantic -Wfloat-equal -Wshadow -std=c2x -lm -latomic -Wfatal-errors -fsanitize=alignment,undefined -fsanitize-address-use-after-scope -fno-omit-frame-pointer';
   $self->{options_paste}   = '-fdiagnostics-show-caret';
   $self->{options_nopaste} = '-fno-diagnostics-show-caret';
   $self->{cmdline}         = 'gcc -gdwarf-2 -g3 $sourcefile $options -o $execfile';
diff --git a/applets/pbot-vm/host/lib/Languages/clang2x.pm b/applets/pbot-vm/host/lib/Languages/clang2x.pm
index 7dccfcf0..3b98a8a9 100755
--- a/applets/pbot-vm/host/lib/Languages/clang2x.pm
+++ b/applets/pbot-vm/host/lib/Languages/clang2x.pm
@@ -14,7 +14,7 @@ sub initialize {
 
   $self->{sourcefile}      = 'prog.c';
   $self->{execfile}        = 'prog';
-  $self->{default_options} = '-Wextra -Wall -Wno-unused-parameter -Wno-unused-variable -pedantic -Wfloat-equal -Wshadow -std=c2x -lm -Wfatal-errors -fsanitize=integer,alignment,undefined -fsanitize-address-use-after-scope -fno-omit-frame-pointer';
+  $self->{default_options} = '-Wextra -Wall -Wno-unused-parameter -Wno-unused-variable -pedantic -Wfloat-equal -Wshadow -std=c2x -lm -latomic -Wfatal-errors -fsanitize=integer,alignment,undefined -fsanitize-address-use-after-scope -fno-omit-frame-pointer';
   $self->{options_paste}   = '-fcaret-diagnostics';
   $self->{options_nopaste} = '-fno-caret-diagnostics';
   $self->{cmdline}         = 'clang -gdwarf-2 -g3 $sourcefile $options -o $execfile';