diff --git a/migram.m b/migram.m
index 66264923b278ba52b2ff0a7e72d56adec61e5660..3de4e271b98335c242e6a6a9c06ad1dc8c5f3da4 100644
--- a/migram.m
+++ b/migram.m
@@ -94,7 +94,7 @@ if length(i_num) > 4 && ~isempty(varargin{i_num(5)})
 end
 
 if length(i_num) > 5 && ~isempty(varargin{i_num(6)})
-    noverlap = varargin{i_num(6)};
+    nbins = varargin{i_num(6)};
     if nbins <= 0, error('Requires positive integer value for NBINS.'), end
     if length(nbins) > 1, error('Requires NBINS to be a scalar.'), end
 end