diff --git a/apps/openmw/mwmechanics/aicombat.cpp b/apps/openmw/mwmechanics/aicombat.cpp
index b5e7594f3..f6123c12c 100644
--- a/apps/openmw/mwmechanics/aicombat.cpp
+++ b/apps/openmw/mwmechanics/aicombat.cpp
@@ -715,16 +715,18 @@ osg::Vec3f AimDirToMovingTarget(const MWWorld::Ptr& actor, const MWWorld::Ptr& t
     float t_collision;
 
     float projVelDirSquared = projSpeed * projSpeed - velPerp * velPerp;
+    if (projVelDirSquared > 0)
+    {
+        osg::Vec3f vTargetMoveDirNormalized = vTargetMoveDir;
+        vTargetMoveDirNormalized.normalize();
 
-    osg::Vec3f vTargetMoveDirNormalized = vTargetMoveDir;
-    vTargetMoveDirNormalized.normalize();
-
-    float projDistDiff = vDirToTarget * vTargetMoveDirNormalized; // dot product
-    projDistDiff = std::sqrt(distToTarget * distToTarget - projDistDiff * projDistDiff);
+        float projDistDiff = vDirToTarget * vTargetMoveDirNormalized; // dot product
+        projDistDiff = std::sqrt(distToTarget * distToTarget - projDistDiff * projDistDiff);
 
-    if (projVelDirSquared > 0)
         t_collision = projDistDiff / (std::sqrt(projVelDirSquared) - velDir);
-    else t_collision = 0; // speed of projectile is not enough to reach moving target
+    }
+    else
+        t_collision = 0; // speed of projectile is not enough to reach moving target
 
     return vDirToTarget + vTargetMoveDir * t_collision;
 }