diff --git a/lang/boolean.c b/lang/boolean.c
index fcb7dfa..9b22f88 100644
--- a/lang/boolean.c
+++ b/lang/boolean.c
@@ -36,7 +36,7 @@
 	abort_if(arg_count != 1, "boolean_invert called with extra arguments");
 	bool value = boolean_value(obj);
 	bool invert = !value;
-	vm_stack_set(state, 0, boolean_create(invert ));
+	vm_stack_set(state, 0, boolean_create(invert));
 }
 
 static struct object_call calls[] = {