The present document describes a clip for securing a tight connection between two modular panels. The connection has a male portion on a first one of the two modular panels, and a female portion on a second one of the two modular panels. The male portion is for being inserted into the female portion upon assembly of the two modular panels side by side. The clip comprises a first flat member having a first pressure edge, and a second flat member having a second pressure edge. The second flat member is fixedly joined to the first flat member. The panels are assembled in an assembly direction. Upon introduction of the first flat member into the male portion, and of the second flat member into the female portion perpendicularly to the assembly direction, the first pressure edge of the first flat member forces the male portion toward the female portion, while the second pressure edge of the second flat member forces the female portion toward the male portion. These forces secure the tight connection between the two modular panels.