diff --git a/src/lsystem/screen/AbstractListener.java b/src/lsystem/screen/AbstractListener.java
index 64a66cd..66f904d 100644
--- a/src/lsystem/screen/AbstractListener.java
+++ b/src/lsystem/screen/AbstractListener.java
@@ -50,7 +50,7 @@ public abstract class AbstractListener implements GLEventListener {
 
         gl.glMatrixMode(GL2.GL_PROJECTION);
         gl.glLoadIdentity();
-        glu.gluPerspective(60.0f, (float) width / height, 0.1f, 1000.0f);
+        glu.gluPerspective(60.0f, ((float) width) / height, 0.1f, 1000.0f);
     }
 
     public abstract void drawLSystem(GL2 gl, Element element);
diff --git a/src/lsystem/utils/Pair.java b/src/lsystem/utils/Pair.java
index 4ed5df6..313b7a8 100644
--- a/src/lsystem/utils/Pair.java
+++ b/src/lsystem/utils/Pair.java
@@ -38,7 +38,7 @@ public class Pair<U, K> {
             return false;
         }
         final Pair<?, ?> other = (Pair<?, ?>) obj;
-        return this.left.equals(other.getLeft()) && this.left.equals(other.getRight());
+        return this.left.equals(other.getLeft()) && this.right.equals(other.getRight());
     }
 
     @Override