A method for correcting an inclined position of a product exiting a gap of two folding rollers of a longitudinal folding machine , wherein - the product is conveyed on a folding table from an entry point along a first transport direction (T1), preferably parallel to the folding table plane, and is pressed into the nip between the rollers by a folding blade that can be moved up and down relative to the folding table , then leaves the nip between the rollers and is transported in a second direction of transport (T2), - wherein the moment of passage of a leading or trailing product edge of the product is detected at two measurement points (S5; S6) which are spaced apart from each other and arranged transversely to the second direction of transport (T2) of the product to be folded, - based on the moments of passage detected at the two measurement points (S5; S6) and on commutation and/or data processing techniques, a deviation Δt2 between a time offset detected during the passage of the corresponding product edge at the two measurement points (S5; S6) and a nominal time offset is determined and analyzed, - and in the event that the deviation Δt2 exceeds at least the tolerance range, a measure is initiated by means of a control process in order to act against the deviation Δt2, said measure being based on retaining the product to a greater or lesser extent when passing the folding rollers and/or on more or less friction between the braking elements (31; 32; 33; 34) and the product , characterized in that the moment of passage is detected at a product edge of a product folded lengthwise exiting the gap of the folding roller after passing the gap . - the product is conveyed on a folding table from an entry point along a first transport direction (T1), preferably parallel to the folding table plane, and is pressed into the nip between the rollers by a folding blade that can be moved up and down relative to the folding table , then leaves the nip between the rollers and is transported in a second direction of transport (T2), - wherein the moment of passage of a leading or trailing product edge of the product is detected at two measurement points (S5; S6) which are spaced apart from each other and arranged transversely to the second direction of transport (T2) of the product to be folded, - based on the moments of passage detected at the two measurement points (S5; S6) and on commutation and/or data processing techniques, a deviation Δt2 between a time offset detected during the passage of the corresponding product edge at the two measurement points (S5; S6) and a nominal time offset is determined and analyzed, - and in the event that the deviation Δt2 exceeds at least the tolerance range, a measure is initiated by means of a control process in order to act against the deviation Δt2, said measure being based on retaining the product to a greater or lesser extent when passing the folding rollers and/or on more or less friction between the braking elements (31; 32; 33; 34) and the product , characterized in that the moment of passage is detected at a product edge of a product folded lengthwise exiting the gap of the folding roller after passing the gap . <EOS>