Question: Has the basal area of pine and spruce in a protected forest changed between 1937 and 2022? And has there been a change in size distribution?Location: Säby Västerksog, a pine-dominated coniferous forest protected for 100 years.Method: A part of the reserve was mapped, and diameter at breast height, using the same methods as used in 1937.Results: Basal area had increased for both pine and spruce but mostly for pine. More pine than spruce had survived from 1937. On the other hand, more spruce than pine had become established after 1937. The size distribution of pine had shifted towards larger trees, with few smaller ones. The corresponding distribution among spruce showed a decline towards larger trees (except the largest ones).Conclusion: The reason for the poor regeneration of pine is probably due to a combination of shade intolerance and a lack disturbances needed for this species (e.g. forest fires). Due to these hindrances pine is expected to decrease within a longer time frame, while spruce is expected to increase.