  In its original version, the minimal 3-3-1 model possess a Landau-pole around
2-6 TeV scale. Current LHC bound on $Z^{\prime}$ implies that the
$SU(3)_L\times U(1)_X$ symmetry must break spontaneously around 4 TeV which
means that the model may lose its perturbative character even before symmetry
breaking. This is a disaster for the model. Few attention has been devoted to
this problem. Here we investigate the efficiency of scalar leptoquarks in
evading or shifting the Landau pole to a harmless energy scale.
