diff --git a/src/com/joml/Matrix4f.java b/src/com/joml/Matrix4f.java
index <HASH>..<HASH> 100644
--- a/src/com/joml/Matrix4f.java
+++ b/src/com/joml/Matrix4f.java
@@ -1545,9 +1545,9 @@ public class Matrix4f implements Serializable, Externalizable {
         float h = (float)Math.tan(Math.toRadians(fovy) * 0.5f) * zNear;

         float w = h * aspect;

         float fl = -w;

-        float fr = fl + 2.0f * w;

+        float fr = +w;

         float fb = -h;

-        float ft = fb + 2.0f * h;

+        float ft = +h;

         return frustum(fl, fr, fb, ft, zNear, zFar);

     }
Simpler computation of perspective frustum