diff --git a/src/p_map.cpp b/src/p_map.cpp
index f5a19f2695..c89418a32b 100644
--- a/src/p_map.cpp
+++ b/src/p_map.cpp
@@ -5178,8 +5178,8 @@ void P_RadiusAttack(AActor *bombspot, AActor *bombsource, int bombdamage, int bo
 			}
 			points *= thing->GetClass()->RDFactor;
 
-			// points and bombdamage should be the same sign
-			if (((int(points) * bombdamage) > 0) && P_CheckSight(thing, bombspot, SF_IGNOREVISIBILITY | SF_IGNOREWATERBOUNDARY))
+			// points and bombdamage should be the same sign (the double cast of 'points' is needed to prevent overflows and incorrect values slipping through.)
+			if ((((double)int(points) * bombdamage) > 0) && P_CheckSight(thing, bombspot, SF_IGNOREVISIBILITY | SF_IGNOREWATERBOUNDARY))
 			{ // OK to damage; target is in direct path
 				double vz;
 				double thrust;