diff --git a/readLib/source/Interface.dummy.cc b/readLib/source/Interface.dummy.cc
index 2f0425074f61c3d1860e1dfe39753e5ce116db6c..7e0fb8ae76dc3b0c6ada2f82ce906340a77e2c37 100644
--- a/readLib/source/Interface.dummy.cc
+++ b/readLib/source/Interface.dummy.cc
@@ -41,7 +41,7 @@ namespace corsika_data {
   }
   void cordataclosefile_() { CorDataCloseFile(); }
   double cordatanextnumber_() { return CorDataNextNumber(); }
-  int cordatanexttext_(char* data) {
+  int cordatanexttext_(char*) {
     std::runtime_error("Cannot read compressed data files with dummy library.");
     return 0;
   }