diff --git a/src/test/java/inferWildcards/TestInferWildcardsJavaTx.java b/src/test/java/inferWildcards/TestInferWildcardsJavaTx.java
index 240cd756..138ca730 100644
--- a/src/test/java/inferWildcards/TestInferWildcardsJavaTx.java
+++ b/src/test/java/inferWildcards/TestInferWildcardsJavaTx.java
@@ -32,20 +32,20 @@ public class TestInferWildcardsJavaTx
 		return new JavaTXCompiler(files1);
 	}
 
-	private Map<TypePlaceholder, RefType> generateTph (JavaTXCompiler javaTXCompiler) {
+	private static Map<TypePlaceholder, RefType> generateTph (JavaTXCompiler javaTXCompiler) {
 		System.out.println("\nReplacements:");
 
 		return TypePlaceholderReplaceUtils.generateTypePlaceholder(javaTXCompiler);
 	}
 
-	private ConstraintSet<Pair> getGeneratedConstraints (Map<TypePlaceholder, RefType> tphMap) {
+	private static ConstraintSet<Pair> getGeneratedConstraints (Map<TypePlaceholder, RefType> tphMap) {
 		System.out.println("\nGenerated TPH:");
 		System.out.println(tphMap);
 
 		return ConstraintsGenerationUtils.generateConstraints(tphMap);
 	}
 
-	private ConstraintSet<Pair> combineConstraints (JavaTXCompiler javaTXCompiler,
+	private static ConstraintSet<Pair> combineConstraints (JavaTXCompiler javaTXCompiler,
 			ConstraintSet<Pair> generatedConstraints)
 			throws ClassNotFoundException, IOException {
 		System.out.println("\nGenerated Constraints:");