diff --git a/drivers/gles3/storage/light_storage.cpp b/drivers/gles3/storage/light_storage.cpp
index f58f769b3e4..75dbd8869da 100644
--- a/drivers/gles3/storage/light_storage.cpp
+++ b/drivers/gles3/storage/light_storage.cpp
@@ -350,7 +350,14 @@ AABB LightStorage::light_get_aabb(RID p_light) const {
 	switch (light->type) {
 		case RS::LIGHT_SPOT: {
 			float len = light->param[RS::LIGHT_PARAM_RANGE];
-			float size = Math::tan(Math::deg_to_rad(light->param[RS::LIGHT_PARAM_SPOT_ANGLE])) * len;
+			float angle = Math::deg_to_rad(light->param[RS::LIGHT_PARAM_SPOT_ANGLE]);
+
+			if (angle > Math::PI * 0.5) {
+				// Light casts backwards as well.
+				return AABB(Vector3(-1, -1, -1) * len, Vector3(2, 2, 2) * len);
+			}
+
+			float size = Math::sin(angle) * len;
 			return AABB(Vector3(-size, -size, -len), Vector3(size * 2, size * 2, len));
 		};
 		case RS::LIGHT_OMNI: {
diff --git a/servers/rendering/renderer_rd/storage_rd/light_storage.cpp b/servers/rendering/renderer_rd/storage_rd/light_storage.cpp
index bfbf85aa350..b0268c2c83d 100644
--- a/servers/rendering/renderer_rd/storage_rd/light_storage.cpp
+++ b/servers/rendering/renderer_rd/storage_rd/light_storage.cpp
@@ -432,7 +432,14 @@ AABB LightStorage::light_get_aabb(RID p_light) const {
 	switch (light->type) {
 		case RS::LIGHT_SPOT: {
 			float len = light->param[RS::LIGHT_PARAM_RANGE];
-			float size = Math::tan(Math::deg_to_rad(light->param[RS::LIGHT_PARAM_SPOT_ANGLE])) * len;
+			float angle = Math::deg_to_rad(light->param[RS::LIGHT_PARAM_SPOT_ANGLE]);
+
+			if (angle > Math::PI * 0.5) {
+				// Light casts backwards as well.
+				return AABB(Vector3(-1, -1, -1) * len, Vector3(2, 2, 2) * len);
+			}
+
+			float size = Math::sin(angle) * len;
 			return AABB(Vector3(-size, -size, -len), Vector3(size * 2, size * 2, len));
 		};
 		case RS::LIGHT_OMNI: {