diff --git a/app/blob.c b/app/blob.c
index bab20109c1..eaf508e655 100644
--- a/app/blob.c
+++ b/app/blob.c
@@ -640,7 +640,7 @@ blob_ellipse (double xc, double yc, double xp, double yp, double xq, double yq)
   /* Figure out a step that will draw most of the points */
 
   r1 = sqrt (xp * xp + yp * yp);
-  r2 = sqrt (xp * xp + yp * yp);
+  r2 = sqrt (xq * xq + yq * yq); 
   max_radius = MAX (r1, r2);
   step = TABLE_SIZE;
 
diff --git a/app/paint/gimpink-blob.c b/app/paint/gimpink-blob.c
index bab20109c1..eaf508e655 100644
--- a/app/paint/gimpink-blob.c
+++ b/app/paint/gimpink-blob.c
@@ -640,7 +640,7 @@ blob_ellipse (double xc, double yc, double xp, double yp, double xq, double yq)
   /* Figure out a step that will draw most of the points */
 
   r1 = sqrt (xp * xp + yp * yp);
-  r2 = sqrt (xp * xp + yp * yp);
+  r2 = sqrt (xq * xq + yq * yq); 
   max_radius = MAX (r1, r2);
   step = TABLE_SIZE;
 
diff --git a/app/tools/blob.c b/app/tools/blob.c
index bab20109c1..eaf508e655 100644
--- a/app/tools/blob.c
+++ b/app/tools/blob.c
@@ -640,7 +640,7 @@ blob_ellipse (double xc, double yc, double xp, double yp, double xq, double yq)
   /* Figure out a step that will draw most of the points */
 
   r1 = sqrt (xp * xp + yp * yp);
-  r2 = sqrt (xp * xp + yp * yp);
+  r2 = sqrt (xq * xq + yq * yq); 
   max_radius = MAX (r1, r2);
   step = TABLE_SIZE;
 
diff --git a/app/tools/gimpinktool-blob.c b/app/tools/gimpinktool-blob.c
index bab20109c1..eaf508e655 100644
--- a/app/tools/gimpinktool-blob.c
+++ b/app/tools/gimpinktool-blob.c
@@ -640,7 +640,7 @@ blob_ellipse (double xc, double yc, double xp, double yp, double xq, double yq)
   /* Figure out a step that will draw most of the points */
 
   r1 = sqrt (xp * xp + yp * yp);
-  r2 = sqrt (xp * xp + yp * yp);
+  r2 = sqrt (xq * xq + yq * yq); 
   max_radius = MAX (r1, r2);
   step = TABLE_SIZE;