diff --git a/include/core.h b/include/core.h
index 29b638b..b958cb9 100644
--- a/include/core.h
+++ b/include/core.h
@@ -77,13 +77,13 @@ typedef struct shoppyou {
 #define HOLE_ID (-1)
 
 // Hole sasa constant
-const Sasa HOLE_SASA = {HOLE_ID};
+static const Sasa HOLE_SASA = {HOLE_ID};
 
 // Hole tanzaku constant
-const Tanzaku HOLE_TANZAKU = {HOLE_ID};
+static const Tanzaku HOLE_TANZAKU = {HOLE_ID};
 
 // Hole kazari constant
-const Kazari HOLE_KAZARI = {HOLE_ID};
+static const Kazari HOLE_KAZARI = {HOLE_ID};
 
 // ==================== SASAHYOU SECTION ==================== //
 
diff --git a/src/core/shoppyou.c b/src/core/shoppyou.c
index 7ca461d..a2d9c84 100644
--- a/src/core/shoppyou.c
+++ b/src/core/shoppyou.c
@@ -66,7 +66,7 @@ int shoppyou_save(Shoppyou *shoppyou) {
     fwrite(&size, 8, 1, shoppyou->file);
     fflush(shoppyou->file);
     for (uint64_t i = 0; i < shoppyou->size; i++) {
-        if (shoppyou->database[i].sasa_id != 0 && shoppyou->database[i].tanzaku_id != 0) {
+        if (shoppyou->database[i].sasa_id != HOLE_ID && shoppyou->database[i].tanzaku_id != HOLE_ID) {
             fwrite(&shoppyou->database[i].created_ts, 8, 1, shoppyou->file);
             fwrite(&shoppyou->database[i].sasa_id, 8, 1, shoppyou->file);
             fwrite(&shoppyou->database[i].tanzaku_id, 8, 1, shoppyou->file);