diff --git a/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java b/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java
index a77ff228..b1b2aa2f 100644
--- a/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java
+++ b/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java
@@ -666,6 +666,7 @@ public class JavaTXCompiler {
 	public final Map<JavaClassName, ClassEntry> loadedClasses = new HashMap<>();
 
 	private SourceFile parse(File sourceFile) throws IOException, java.lang.ClassNotFoundException {
+		if (sourceFiles.containsKey(sourceFile)) return sourceFiles.get(sourceFile);
 		SourceFileContext tree = JavaTXParser.parse(sourceFile);
 		environment.addClassesToRegistry(classRegistry, tree, sourceFile, this);
 		SyntaxTreeGenerator generator = new SyntaxTreeGenerator(this, classRegistry, new GenericsRegistry(null), sourceFile.getName());
@@ -740,7 +741,9 @@ public class JavaTXCompiler {
 		var sf = sourceFiles.get(sourceFile);
 		if (sf.isGenerated()) return null;
 		List<ResultSet> typeinferenceResult = this.typeInference(sourceFile);
-		return generateBytecode(sf, typeinferenceResult);
+		var classes = generateBytecode(sf, typeinferenceResult);
+		sf.setGenerated();
+		return classes;
 	}
 
 	private Map<SourceFile, List<GenericsResult>> generatedGenerics = new HashMap<>();