diff --git a/src/core/sappyou.c b/src/core/sappyou.c
index 65182fd..7a7c723 100644
--- a/src/core/sappyou.c
+++ b/src/core/sappyou.c
@@ -158,7 +158,7 @@ int tanzaku_rem(Sappyou *sappyou, uint64_t tanzaku_id) {
         return 1;
     }
     if (tanzaku_id >= sappyou->size) {
-        fprintf(stderr, "Failed to remove tanzaku: target tanzaku does not exist\n");
+        fprintf(stderr, "Failed to remove tanzaku: too big ID\n");
         return 1;
     }
     if (sappyou->database[tanzaku_id].id == HOLE_ID) {
diff --git a/src/core/sasahyou.c b/src/core/sasahyou.c
index 282ccaf..1b0960d 100644
--- a/src/core/sasahyou.c
+++ b/src/core/sasahyou.c
@@ -141,7 +141,7 @@ int sasa_rem(Sasahyou *sasahyou, uint64_t sasa_id) {
         return 1;
     }
     if (sasa_id >= sasahyou->size) {
-        fprintf(stderr, "Failed to remove sasa: target sasa does not exist\n");
+        fprintf(stderr, "Failed to remove sasa: too big ID\n");
         return 1;
     }
     if (sasahyou->database[sasa_id].id == HOLE_ID) {