diff --git a/src/game/Spells.cpp b/src/game/Spells.cpp
index 640adc82da..d48511c415 100644
--- a/src/game/Spells.cpp
+++ b/src/game/Spells.cpp
@@ -550,7 +550,7 @@ void ARX_SPELLS_ManageMagic() {
 				
 				ArxInstant now = arxtime.now_ul();
 				
-				const unsigned long interval = 1000 / 60;
+				const ArxInstant interval = 1000 / 60;
 				
 				if(ARX_FLARES_broken) {
 					g_LastFlarePosition = pos;
diff --git a/src/game/magic/spells/SpellsLvl06.cpp b/src/game/magic/spells/SpellsLvl06.cpp
index ae8ad2544a..2d467e66b6 100644
--- a/src/game/magic/spells/SpellsLvl06.cpp
+++ b/src/game/magic/spells/SpellsLvl06.cpp
@@ -274,7 +274,7 @@ void CreateFieldSpell::Launch()
 {
 	ArxInstant start = arxtime.now_ul();
 	if(m_flags & SPELLCAST_FLAG_RESTORE) {
-		start -= std::min(start, 4000l);
+		start -= std::min(start, ArxInstant(4000l));
 	}
 	m_timcreation = start;
 	
diff --git a/src/script/Script.cpp b/src/script/Script.cpp
index dedfd6d1d9..283a1a7a6a 100644
--- a/src/script/Script.cpp
+++ b/src/script/Script.cpp
@@ -1847,8 +1847,9 @@ void ARX_SCRIPT_Timer_Check() {
 		if((st->flags & 1) && !(st->io->gameFlags & GFLAG_ISINTREATZONE)) {
 			long increment = (now - st->tim) / st->msecs;
 			st->tim += st->msecs * increment;
+			// TODO print full 64-bit time
 			arx_assert(st->tim <= now && st->tim + st->msecs > now,
-			           "start=%lu wait=%ld now=%lu", st->tim, st->msecs, now);
+			           "start=%lu wait=%ld now=%lu", (long)st->tim, (long)st->msecs, (long)now);
 			continue;
 		}