diff --git a/OpenRA.Mods.Common/Projectiles/Railgun.cs b/OpenRA.Mods.Common/Projectiles/Railgun.cs
index 0701cef67b..79032ba6fe 100644
--- a/OpenRA.Mods.Common/Projectiles/Railgun.cs
+++ b/OpenRA.Mods.Common/Projectiles/Railgun.cs
@@ -153,14 +153,17 @@ namespace OpenRA.Mods.Common.Projectiles
 
 			// An easy vector to find which is perpendicular vector to forwardStep, with 0 Z component
 			LeftVector = new WVec(ForwardStep.Y, -ForwardStep.X, 0);
-			LeftVector = 1024 * LeftVector / LeftVector.Length;
+			if (LeftVector.LengthSquared != 0)
+				LeftVector = 1024 * LeftVector / LeftVector.Length;
 
 			// Vector that is pointing upwards from the ground
 			UpVector = new WVec(
 				-ForwardStep.X * ForwardStep.Z,
 				-ForwardStep.Z * ForwardStep.Y,
 				ForwardStep.X * ForwardStep.X + ForwardStep.Y * ForwardStep.Y);
-			UpVector = 1024 * UpVector / UpVector.Length;
+
+			if (UpVector.LengthSquared != 0)
+				UpVector = 1024 * UpVector / UpVector.Length;
 
 			//// LeftVector and UpVector are unit vectors of size 1024.