diff --git a/src/main/java/edu/kit/kastel/vads/compiler/parser/Parser.java b/src/main/java/edu/kit/kastel/vads/compiler/parser/Parser.java
index f152cc8..57c9de8 100644
--- a/src/main/java/edu/kit/kastel/vads/compiler/parser/Parser.java
+++ b/src/main/java/edu/kit/kastel/vads/compiler/parser/Parser.java
@@ -40,7 +40,11 @@ public class Parser {
     }
 
     public ProgramTree parseProgram() {
-        return new ProgramTree(List.of(parseFunction()));
+        ProgramTree programTree = new ProgramTree(List.of(parseFunction()));
+        if (this.tokenSource.hasMore()) {
+            throw new ParseException("expected end of input but got " + this.tokenSource.peek());
+        }
+        return programTree;
     }
 
     private FunctionTree parseFunction() {
diff --git a/src/main/java/edu/kit/kastel/vads/compiler/parser/TokenSource.java b/src/main/java/edu/kit/kastel/vads/compiler/parser/TokenSource.java
index 7790c0a..984cdee 100644
--- a/src/main/java/edu/kit/kastel/vads/compiler/parser/TokenSource.java
+++ b/src/main/java/edu/kit/kastel/vads/compiler/parser/TokenSource.java
@@ -75,6 +75,10 @@ public class TokenSource {
         return token;
     }
 
+    public boolean hasMore() {
+        return this.idx < this.tokens.size();
+    }
+
     private void expectHasMore() {
         if (this.idx >= this.tokens.size()) {
             throw new ParseException("reached end of file");