diff --git a/platform.h b/platform.h
index c4e5609a..bc42cc5e 100644
--- a/platform.h
+++ b/platform.h
@@ -33,7 +33,11 @@
 /// ----------
 
 #if (__cplusplus < 201103L)
-	#define nullptr 0
+	#ifdef __LARGE__
+		#define nullptr 0UL
+	#else
+		#define nullptr 0U
+	#endif
 #endif
 
 // Message-less static_assert() wasn't available until C++17
diff --git a/th01/fuuin_01.cpp b/th01/fuuin_01.cpp
index c428c630..a5c6575a 100644
--- a/th01/fuuin_01.cpp
+++ b/th01/fuuin_01.cpp
@@ -96,5 +96,5 @@ void main(int argc, const char *argv[])
 	game_init();
 	end_and_verdict_and_regist_animate();
 	game_switch_binary();
-	execl(BINARY_OP, BINARY_OP, nullptr, nullptr);
+	execl(BINARY_OP, BINARY_OP, nullptr);
 }
diff --git a/th01/main/hud/menu.cpp b/th01/main/hud/menu.cpp
index a66c4c2b..069f8910 100644
--- a/th01/main/hud/menu.cpp
+++ b/th01/main/hud/menu.cpp
@@ -240,7 +240,7 @@ bool16 continue_menu(void)
 				resident->snd_need_init = false;
 				game_switch_binary();
 				resident->point_value = 0;
-				execl(BINARY_MAIN_CAPS, BINARY_MAIN_CAPS, nullptr, nullptr);
+				execl(BINARY_MAIN_CAPS, BINARY_MAIN_CAPS, nullptr);
 			} else {
 				no_continue:
 				player_is_hit = false;
diff --git a/th01/main_01.cpp b/th01/main_01.cpp
index 8fc71db2..986f0a01 100644
--- a/th01/main_01.cpp
+++ b/th01/main_01.cpp
@@ -891,7 +891,7 @@ int main(void)
 					}
 					frame_delay(120);
 					game_switch_binary();
-					execl(BINARY_END, BINARY_END, nullptr, nullptr);
+					execl(BINARY_END, BINARY_END, nullptr);
 				}
 
 				// ZUN quirk: Placing this after the [game_cleared] branch robs
@@ -956,7 +956,7 @@ int main(void)
 				mdrv2_bgm_fade_out_nonblock();
 				resident->bombs = bombs;
 				game_switch_binary();
-				execl(BINARY_MAIN, BINARY_MAIN, nullptr, nullptr);
+				execl(BINARY_MAIN, BINARY_MAIN, nullptr);
 			}
 			orb_in_portal = false;
 			if(boss_id == BID_NONE) {
@@ -1002,6 +1002,6 @@ op:
 	game_switch_binary();
 	key_end();
 	arc_free();
-	execl(BINARY_OP, BINARY_OP, nullptr, nullptr);
+	execl(BINARY_OP, BINARY_OP, nullptr);
 	return 0;
 }