diff --git a/TacticalAI/AIInternals.h b/TacticalAI/AIInternals.h
index d0a81528..58c6a60a 100644
--- a/TacticalAI/AIInternals.h
+++ b/TacticalAI/AIInternals.h
@@ -269,7 +269,7 @@ UINT8 StanceChange( SOLDIERTYPE * pSoldier, INT16 ubAttackAPCost );
 INT32 TrackScent( SOLDIERTYPE * pSoldier );
 void RefreshAI(SOLDIERTYPE *pSoldier);
 BOOLEAN InLightAtNight( INT32 sGridNo, INT8 bLevel );
-INT16 FindNearbyDarkerSpot( SOLDIERTYPE *pSoldier );
+INT32 FindNearbyDarkerSpot( SOLDIERTYPE *pSoldier );
 
 BOOLEAN ArmySeesOpponents( void );
 
diff --git a/TacticalAI/FindLocations.cpp b/TacticalAI/FindLocations.cpp
index 11916dbb..4c6eab27 100644
--- a/TacticalAI/FindLocations.cpp
+++ b/TacticalAI/FindLocations.cpp
@@ -1647,7 +1647,7 @@ INT32 FindNearestUngassedLand(SOLDIERTYPE *pSoldier)
 	return(sClosestLand);
 }
 
-INT16 FindNearbyDarkerSpot( SOLDIERTYPE *pSoldier )
+INT32 FindNearbyDarkerSpot( SOLDIERTYPE *pSoldier )
 {
 	INT32 sGridNo, sClosestSpot = NOWHERE, sPathCost;
 	INT32	iSpotValue, iBestSpotValue = 1000;