diff --git a/src/debug.c b/src/debug.c
index d59d8e9c4..c17c09580 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -159,11 +159,7 @@ mrb_debug_get_line(mrb_state *mrb, const mrb_irep *irep, uint32_t pc)
 MRB_API mrb_bool
 mrb_debug_get_position(mrb_state *mrb, const mrb_irep *irep, uint32_t pc, int32_t *lp, const char **fp)
 {
-  if (irep && pc < irep->ilen) {
-    if (!irep->debug_info) {
-      *lp = -1; *fp = NULL;
-      return FALSE;
-    }
+  if (irep && pc < irep->ilen && irep->debug_info) {
     mrb_irep_debug_info_file *f = get_file(irep->debug_info, pc);
     *lp = debug_get_line(mrb, f, pc);
     if (*lp > 0) {
@@ -171,6 +167,7 @@ mrb_debug_get_position(mrb_state *mrb, const mrb_irep *irep, uint32_t pc, int32_
       if (*fp) return TRUE;
     }
   }
+  *lp = -1; *fp = NULL;
   return FALSE;
 }