The present application relates to a stabilizing element (1) for a scaffold platform, wherein the stabilizing element (1) has a longitudinal direction y and a transverse direction x, a top portion (2) and a bottom portion (3) separated in the transverse direction x, and a first end wall (4) and a second end wall (4') connecting the top portion (2) and the bottom portion (3). The stabilizing element (1) further comprises a guide channel (5) extending in the longitudinal direction y of the stabilizing element (1) between the end walls (4, 4') and terminating in an receiving aperture (30) in the second end wall (4'). The guide channel (5) comprises an elongated opening (6), extending parallel with the guide channel (5) from the first end wall (4) a distance towards the second end wall (4') in the longitudinal direction y of the stabilizing element (1). The stabilizing element (1) also comprises an elongated locking member (8) arranged inside the guide channel (5) and being movable inside the guide channel (5) between a first position (29) and a second position (29') being defined by the elongated opening (6), such that the elongated locking member (8) protrudes out through the receiving aperture (25) in the second end wall (4') when the elongated locking member (8) is in the second position (29').