diff --git a/src/main/java/de/neemann/digital/analyse/quinemc/QuineMcCluskey.java b/src/main/java/de/neemann/digital/analyse/quinemc/QuineMcCluskey.java
index 46ae92d75..81a60f75e 100644
--- a/src/main/java/de/neemann/digital/analyse/quinemc/QuineMcCluskey.java
+++ b/src/main/java/de/neemann/digital/analyse/quinemc/QuineMcCluskey.java
@@ -270,8 +270,6 @@ public class QuineMcCluskey {
             availPrimes.addAll(primes);
             primes.clear();
             primeSelector.select(primes, availPrimes, columns);
-            if (primes.size() < availPrimes.size())
-                System.out.println("reduced from " + availPrimes.size() + " primes to " + primes.size()+" primes.");
         }
 
         return this;
diff --git a/src/test/java/de/neemann/digital/analyse/quinemc/QuineMcCluskeyDontCareTest.java b/src/test/java/de/neemann/digital/analyse/quinemc/QuineMcCluskeyDontCareTest.java
index 51d7dd8f9..30908cc46 100644
--- a/src/test/java/de/neemann/digital/analyse/quinemc/QuineMcCluskeyDontCareTest.java
+++ b/src/test/java/de/neemann/digital/analyse/quinemc/QuineMcCluskeyDontCareTest.java
@@ -48,9 +48,9 @@ public class QuineMcCluskeyDontCareTest extends TestCase {
      * @throws ExpressionException
      */
     public void testRegression() throws ExpressionException {
-        for (int n = 4; n < 8; n++) {
+        for (int n = 4; n <= 8; n++) {
             // test some tables with n variables
-            for (int i = 0; i < 200; i++) {
+            for (int i = 0; i < 100; i++) {
                 performTestCalculationRandom(n);
             }
         }