diff --git a/src/main/java/neqsim/thermo/phase/PhaseEos.java b/src/main/java/neqsim/thermo/phase/PhaseEos.java
index e6ca571ed..6c2f3f8ab 100644
--- a/src/main/java/neqsim/thermo/phase/PhaseEos.java
+++ b/src/main/java/neqsim/thermo/phase/PhaseEos.java
@@ -352,8 +352,8 @@ public double molarVolume(double pressure, double temperature, double A, double
         BonVold = 100;
       }
       if (BonV < 0) {
-        // BonV = Math.abs(BonV);
-        BonV = BonVold / 2.0;
+        BonV = BonVold / 2;
+        BonVold = 10;
       }
 
       error = Math.abs((BonV - BonVold) / BonVold);
diff --git a/src/test/java/neqsim/thermodynamicoperations/flashops/TPFlashTest.java b/src/test/java/neqsim/thermodynamicoperations/flashops/TPFlashTest.java
index d83c32e98..8e2ad523e 100644
--- a/src/test/java/neqsim/thermodynamicoperations/flashops/TPFlashTest.java
+++ b/src/test/java/neqsim/thermodynamicoperations/flashops/TPFlashTest.java
@@ -96,8 +96,9 @@ void testRun5() {
     testOps = new ThermodynamicOperations(testSystem5);
     testOps.TPflash();
     testSystem5.initProperties();
+    testSystem5.prettyPrint();
     double beta = testSystem5.getBeta();
-    assertEquals(6.272876522701802E-7, beta, 1e-5);
+    assertEquals(0.999999372713993, beta, 1e-9);
   }
 
   @Test