diff --git a/skimage/feature/_harris.py b/skimage/feature/_harris.py
index 14854ac4..8ab40b22 100644
--- a/skimage/feature/_harris.py
+++ b/skimage/feature/_harris.py
@@ -105,5 +105,5 @@ def harris(image, min_distance=10, threshold=0.1, eps=1e-6,
     harrisim = _compute_harris_response(image, eps=eps,
                     gaussian_deviation=gaussian_deviation)
     coordinates = peak.peak_local_max(harrisim, min_distance=min_distance,
-                                        threshold=threshold)
+                                        threshold_rel=threshold)
     return coordinates