diff --git a/lang-tool/src/main/java/cz/tomaskypta/tools/langtool/exporting/ToolExport.java b/lang-tool/src/main/java/cz/tomaskypta/tools/langtool/exporting/ToolExport.java
index 006f46a..af5efb1 100644
--- a/lang-tool/src/main/java/cz/tomaskypta/tools/langtool/exporting/ToolExport.java
+++ b/lang-tool/src/main/java/cz/tomaskypta/tools/langtool/exporting/ToolExport.java
@@ -130,6 +130,7 @@ private Map<String, Integer> exportDefLang(File valueDir) throws IOException, SA
                 continue;
             }
             keys.putAll(exportDefLangToExcel(rowIndex, project, stringFile, getStrings(stringFile), outExcelFile));
+            rowIndex = keys.size() + 1;
         }