diff --git a/core/base/doc/macros/fillpatterns.C b/core/base/doc/macros/fillpatterns.C
index b0a5132..fca81c8 100644
--- a/core/base/doc/macros/fillpatterns.C
+++ b/core/base/doc/macros/fillpatterns.C
@@ -20,11 +20,11 @@ TCanvas * fillpatterns()
 
    // Fixed patterns.
    for (i=1; i<=5; i++) {
-      box(j++, 0.01, y-bh, 0.19, y);
-      box(j++, 0.21, y-bh, 0.39, y);
-      box(j++, 0.41, y-bh, 0.59, y);
-      box(j++, 0.61, y-bh, 0.79, y);
-      box(j++, 0.81, y-bh, 0.99, y);
+      box(j, 0.01, y-bh, 0.19, y); j++;
+      box(j, 0.21, y-bh, 0.39, y); j++;
+      box(j, 0.41, y-bh, 0.59, y); j++;
+      box(j, 0.61, y-bh, 0.79, y); j++;
+      box(j, 0.81, y-bh, 0.99, y); j++;
       y = y-bh-db;
    }
 
@@ -55,7 +55,7 @@ TCanvas * fillpatterns()
    return Pat;
 }
 
-box(Int_t pat, Double_t x1, Double_t y1, Double_t x2, Double_t  y2)
+void box(Int_t pat, Double_t x1, Double_t y1, Double_t x2, Double_t  y2)
 {
    // Draw an box using the fill pattern "pat" with the "pat" value
    // written on top.