diff --git a/src/main/java/de/stups/probkodkod/SolverChecker.java b/src/main/java/de/stups/probkodkod/SolverChecker.java
index 5d358894ff87b4eb0bce203eb936b1c675183f97..cf7238a7f31af581a8f2a10e4addc78d17085564 100644
--- a/src/main/java/de/stups/probkodkod/SolverChecker.java
+++ b/src/main/java/de/stups/probkodkod/SolverChecker.java
@@ -41,7 +41,7 @@ public class SolverChecker {
 		}
 	}
 
-	public static SATFactory determineSatFactory(SATFactory... factories) {
+	private static SATFactory determineSatFactory(SATFactory... factories) {
 		Map<String, Throwable> throwables = new HashMap<String, Throwable>();
 		for (final SATFactory factory : factories) {
 			try {
diff --git a/src/test/java/de/stups/probkodkod/NegativeIntTest.java b/src/test/java/de/stups/probkodkod/NegativeIntTest.java
index 164137f1e26509c0d426b52688bd968b7b9d9267..0f79c5c78406cc98276c84f35c41ebd595b2f673 100644
--- a/src/test/java/de/stups/probkodkod/NegativeIntTest.java
+++ b/src/test/java/de/stups/probkodkod/NegativeIntTest.java
@@ -5,6 +5,9 @@ package de.stups.probkodkod;
 
 import java.util.Iterator;
 
+import org.junit.Assert;
+import org.junit.Test;
+
 import kodkod.ast.Formula;
 import kodkod.ast.IntConstant;
 import kodkod.ast.Relation;
@@ -17,9 +20,6 @@ import kodkod.instance.TupleFactory;
 import kodkod.instance.TupleSet;
 import kodkod.instance.Universe;
 
-import org.junit.Assert;
-import org.junit.Test;
-
 /**
  * @author plagge
  * 
@@ -45,7 +45,7 @@ public class NegativeIntTest {
 		bounds.bound(x, factory.allOf(1));
 		final Formula formula = x.sum().eq(IntConstant.constant(value));
 		final Solver solver = new Solver();
-		solver.options().setSolver(SolverChecker.determineSatFactory());
+		solver.options().setSolver(SolverChecker.determineSatFactory(SATSolver.sat4j));
 		solver.options().setBitwidth(5);
 		final Iterator<Solution> iterator = solver.solveAll(formula, bounds);
 		Assert.assertTrue("solution expected", iterator.hasNext());
@@ -58,9 +58,7 @@ public class NegativeIntTest {
 			final Object atom = tuple.atom(0);
 			sum += ((Integer) atom).intValue();
 		}
-		Assert.assertEquals("constant in formula and solution should be same",
-				value, sum);
-		Assert.assertTrue("no other solution expected", !iterator.hasNext()
-				|| iterator.next().instance() == null);
+		Assert.assertEquals("constant in formula and solution should be same", value, sum);
+		Assert.assertTrue("no other solution expected", !iterator.hasNext() || iterator.next().instance() == null);
 	}
 }