  We present preliminary results on the axial form factor $G_A(Q^2)$ and the
induced pseudoscalar form factor $G_P(Q^2)$ of the nucleon. A systematic
analysis of the excited-state contributions to form factors is performed on the
CLS ensemble `N6' with $m_\pi = 340 \ \text{MeV}$ and lattice spacing $a \sim
0.05 \ \text{fm}$. The relevant three-point functions were computed with
source-sink separations ranging from $t_s \sim 0.6 \ \text{fm}$ to $t_s \sim \
1.4 \ \text{fm}$. We observe that the form factors suffer from non-trivial
excited-state contributions at the source-sink separations available to us. It
is noted that naive plateau fits underestimate the excited-state contributions
and that the method of summed operator insertions correctly accounts for these
effects.
