diff --git a/app/pdb/gradients-cmds.c b/app/pdb/gradients-cmds.c
index 15d19e694a..98876b4ce7 100644
--- a/app/pdb/gradients-cmds.c
+++ b/app/pdb/gradients-cmds.c
@@ -254,7 +254,7 @@ gradients_get_gradient_data_invoker (GimpProcedure      *procedure,
 
           pv = grad_data;
 
-          while (sample_size)
+          while (sample_size--)
             {
               seg = gimp_gradient_get_color_at (gradient, context, seg,
                                                 pos, reverse, &color);
diff --git a/tools/pdbgen/pdb/gradients.pdb b/tools/pdbgen/pdb/gradients.pdb
index d7a4ae4fcf..336c412752 100644
--- a/tools/pdbgen/pdb/gradients.pdb
+++ b/tools/pdbgen/pdb/gradients.pdb
@@ -224,7 +224,7 @@ sub gradients_get_gradient_data {
 
       pv = grad_data;
 
-      while (sample_size)
+      while (sample_size--)
 	{
 	  seg = gimp_gradient_get_color_at (gradient, context, seg,
                                             pos, reverse, &color);