diff --git a/meson.build b/meson.build
index 6bd1c8c1..fc5bad58 100644
--- a/meson.build
+++ b/meson.build
@@ -12,10 +12,8 @@ project('etl',
 )
 
 compile_args = []
-if get_option('use_stl')
-    compile_args += '-DETL_NO_STL=0'
-elif
-    compile_args += '-DETL_NO_STL=1'
+if not get_option('use_stl')
+    compile_args += '-DETL_NO_STL'
 endif
 
 etl_dep = declare_dependency(