diff --git a/leuvenmapmatching/matcher/base.py b/leuvenmapmatching/matcher/base.py
index 37cd4eb..b60b01c 100644
--- a/leuvenmapmatching/matcher/base.py
+++ b/leuvenmapmatching/matcher/base.py
@@ -643,7 +643,7 @@ def match_incremental(self, path, unique=True, tqdm=None, backtrace_len=None):
                 return [], 0
         else:
             start_obs_idx = len(self.path)
-            for idx in range(len(self.path)):
+            for idx in range(len(path)):
                 self.lattice[start_obs_idx + idx] = LatticeColumn(start_obs_idx + idx)
             self.path += path