diff --git a/iseq.c b/iseq.c
index 2e33e4f589..fb12e9c1d2 100644
--- a/iseq.c
+++ b/iseq.c
@@ -421,7 +421,7 @@ set_relation(rb_iseq_t *iseq, const rb_iseq_t *piseq)
 
 static VALUE
 prepare_iseq_build(rb_iseq_t *iseq,
-		   VALUE name, VALUE path, VALUE realpath, VALUE first_lineno, const rb_code_location_t *code_location, const int node_id,
+                   VALUE name, VALUE path, VALUE realpath, VALUE first_lineno, const rb_code_location_t *code_location, const int node_id,
 		   const rb_iseq_t *parent, enum iseq_type type,
 		   const rb_compile_option_t *option)
 {