diff --git a/stages/text-preprocessing/src/main/java/edu/kit/kastel/mcse/ardoco/core/text/providers/informants/corenlp/textprocessor/HttpCommunicator.java b/stages/text-preprocessing/src/main/java/edu/kit/kastel/mcse/ardoco/core/text/providers/informants/corenlp/textprocessor/HttpCommunicator.java
index 20a42ecb5..358706859 100644
--- a/stages/text-preprocessing/src/main/java/edu/kit/kastel/mcse/ardoco/core/text/providers/informants/corenlp/textprocessor/HttpCommunicator.java
+++ b/stages/text-preprocessing/src/main/java/edu/kit/kastel/mcse/ardoco/core/text/providers/informants/corenlp/textprocessor/HttpCommunicator.java
@@ -39,7 +39,7 @@ public String sendAuthenticatedPostRequest(String requestUrl, String body) throw
         String username = System.getenv(ENV_USERNAME);
         String password = System.getenv(ENV_PASSWORD);
         if (username == null || password == null) {
-            throw new IOException("Environment variables USERNAME and PASSWORD must be set.");
+            throw new IOException("Environment variables " + ENV_USERNAME + " and " + ENV_PASSWORD + " must be set.");
         }
 
         HttpPost request = new HttpPost(requestUrl);