diff --git a/SConstruct b/SConstruct
index 4494b34b..5267c708 100644
--- a/SConstruct
+++ b/SConstruct
@@ -310,6 +310,7 @@ if len(sys.argv) > 1:
 
     arg_split = arg.split('_')
     arg = arg_split[0]
+    arg_split = arg_split[1:]
 
     if arg[0] == 'b':
         build_string = get_exports_for('global') + 'scons '
@@ -352,7 +353,7 @@ if len(sys.argv) > 1:
         for i in range(2, len(sys.argv)):
             build_string += ' ' + sys.argv[i] + ' '
 
-        if '_slim' in arg:
+        if 'slim' in arg_split:
             build_string += 'module_webm_enabled=no module_webp_enabled=no module_arkit_enabled=no module_visual_script_enabled=no module_gdnative_enabled=no module_mobile_vr_enabled=no module_theora_enabled=no module_xatlas_unwrap_enabled=no'
             build_string += ' '