diff --git a/include/d/actor/d_a_nbomb.h b/include/d/actor/d_a_nbomb.h
index fc7901c6a5b..e8402dee4d8 100644
--- a/include/d/actor/d_a_nbomb.h
+++ b/include/d/actor/d_a_nbomb.h
@@ -76,7 +76,7 @@ public:
     /* 804CAEE8 */ int execute();
     /* 804CBC60 */ int draw();
 
-    virtual bool checkExplodeNow() { return field_0xb51 != 0; }
+    virtual u8 checkExplodeNow() { return field_0xb51 != 0; }
     virtual void deleteBombAndEffect() {
         fopAcM_delete(this);
         onStateFlg0(FLG0_UNK_40);
diff --git a/include/d/d_bomb.h b/include/d/d_bomb.h
index ed483eadd05..2c5ed11d568 100644
--- a/include/d/d_bomb.h
+++ b/include/d/d_bomb.h
@@ -32,7 +32,7 @@ public:
     static bool checkWaterBomb(fopAc_ac_c*);
     static bool checkInsectBombMove(fopAc_ac_c*);
 
-    virtual bool checkExplodeNow() { return FALSE; }
+    virtual u8 checkExplodeNow() { return false; }
     virtual void deleteBombAndEffect() {}
     virtual void setCargoBombExplode() {}