diff --git a/src/main/java/de/tum/in/test/api/io/TestInStream.java b/src/main/java/de/tum/in/test/api/io/TestInStream.java
index 808f5fe4..49507b74 100644
--- a/src/main/java/de/tum/in/test/api/io/TestInStream.java
+++ b/src/main/java/de/tum/in/test/api/io/TestInStream.java
@@ -19,7 +19,7 @@ final class TestInStream extends InputStream {
 	@Override
 	public int read() throws IOException {
 		if (input == null)
-			tryLoadNextLine(true);
+			tryLoadNextLine();
 		int res = input.read();
 		if (input.available() == 0)
 			input = null;
@@ -28,15 +28,13 @@ public int read() throws IOException {
 
 	@Override
 	public int available() throws IOException {
-		if (input == null)
-			tryLoadNextLine(false);
 		return input == null ? 0 : input.available();
 	}
 
 	@Override
 	public int read(byte[] b, int off, int len) throws IOException {
 		if (input == null)
-			tryLoadNextLine(true);
+			tryLoadNextLine();
 		int res = input.read(b, off, len);
 		if (input.available() == 0)
 			input = null;
@@ -47,11 +45,9 @@ void resetInternalState() {
 		input = null;
 	}
 
-	private void tryLoadNextLine(boolean force) {
-		if (force || lineProvider.hasNextLine()) {
-			Line currentLine = lineProvider.getNextLine();
-			byte[] bytes = currentLine.text().concat(IOTester.LINE_SEPERATOR).getBytes(StandardCharsets.UTF_8);
-			input = new ByteArrayInputStream(bytes);
-		}
+	private void tryLoadNextLine() {
+		Line currentLine = lineProvider.getNextLine();
+		byte[] bytes = currentLine.text().concat(IOTester.LINE_SEPERATOR).getBytes(StandardCharsets.UTF_8);
+		input = new ByteArrayInputStream(bytes);
 	}
 }
diff --git a/src/test/java/de/tum/in/test/api/io/IOTesterTest.java b/src/test/java/de/tum/in/test/api/io/IOTesterTest.java
index 69e9c421..1a3b66df 100644
--- a/src/test/java/de/tum/in/test/api/io/IOTesterTest.java
+++ b/src/test/java/de/tum/in/test/api/io/IOTesterTest.java
@@ -27,7 +27,7 @@ void testUninstall() {
 	@Test
 	void testReset() {
 		try (Scanner scanner = new Scanner(System.in)) {
-			tester.in().addLinesToInput("X");
+			tester.in().addLinesToInput("X", "Y");
 
 			System.out.println("A");
 			System.err.println("B");
@@ -36,7 +36,7 @@ void testReset() {
 			assertThat(tester.err().getLines()).isNotEmpty();
 			assertThat(scanner.nextLine()).isEqualTo("X");
 
-			tester.in().addLinesToInput("Y");
+			tester.in().addLinesToInput("Z");
 
 			tester.reset();