diff --git a/code/datums/radiation_wave.dm b/code/datums/radiation_wave.dm
index 298dc4d89f..9b225e4f1f 100644
--- a/code/datums/radiation_wave.dm
+++ b/code/datums/radiation_wave.dm
@@ -119,7 +119,8 @@
 	var/did_contam = 0
 	if(can_contam && contam_atoms.len)
 		var/rad_strength = ((strength-RAD_MINIMUM_CONTAMINATION) * RAD_CONTAMINATION_STR_COEFFICIENT)/contam_atoms.len
-		for(var/thing in contam_atoms)
+		for(var/A in contam_atoms)
+				var/atom/thing = A
 			thing.AddComponent(/datum/component/radioactive, rad_strength, source)
 			did_contam = 1
 	return did_contam