diff --git a/src/lisp/compiler.h b/src/lisp/compiler.h
index 6a944e6..5ba6620 100644
--- a/src/lisp/compiler.h
+++ b/src/lisp/compiler.h
@@ -113,7 +113,7 @@
 void display_args(struct args *args);
 
 void compile_expression(struct environment *env, struct local *local,
-                        value_t val, dasm_State **Dst);
+                        value_t val, bool tail, dasm_State **Dst);
 
 /**
  * Compile a function