diff --git a/mesonbuild/ast/interpreter.py b/mesonbuild/ast/interpreter.py
index cc5c94c8b..6a826efbd 100644
--- a/mesonbuild/ast/interpreter.py
+++ b/mesonbuild/ast/interpreter.py
@@ -297,6 +297,11 @@ class AstInterpreter(interpreterbase.InterpreterBase):
         elif isinstance(node, ElementaryNode):
             result = node.value
 
+        elif isinstance(node, NotNode):
+            result = self.resolve_node(node.value, include_unknown_args, id_loop_detect)
+            if isinstance(result, bool):
+                result = not result
+
         elif isinstance(node, ArrayNode):
             result = [x for x in node.args.arguments]