diff --git a/matlab/plotFFdB.m b/matlab/plotFFdB.m
index e021464..07e96e3 100644
--- a/matlab/plotFFdB.m
+++ b/matlab/plotFFdB.m
@@ -44,7 +44,7 @@ for n=1:2:numel(varargin)
 end
 
 D_log = nf2ff.E_norm{freq_index} / max(nf2ff.E_norm{freq_index}(:));
-D_log = 20*log10(D_log) + 10*log10(nf2ff.Dmax);
+D_log = 20*log10(D_log) + 10*log10(nf2ff.Dmax(freq_index));
 
 if (strcmp(xaxis,'theta')==1);
     xax = nf2ff.theta;
diff --git a/matlab/polarFF.m b/matlab/polarFF.m
index dc4d074..96b97da 100644
--- a/matlab/polarFF.m
+++ b/matlab/polarFF.m
@@ -71,7 +71,7 @@ E_far_max = max(nf2ff.E_norm{freq_index}(:));
 if ~isempty(logscale)
     gridmin = logscale(1);
 
-    Dmax = 10*log10(nf2ff.Dmax);
+    Dmax = 10*log10(nf2ff.Dmax(freq_index));
     E_far_scale = Dmax - gridmin;
     E_far = 20*log10(nf2ff.E_norm{freq_index}) - 20*log10(E_far_max) + E_far_scale;
     E_far = E_far .* ( E_far > 0 );