diff --git a/eo-parser/src/main/java/org/eolang/parser/XeEoListener.java b/eo-parser/src/main/java/org/eolang/parser/XeEoListener.java
index e03f8d6dde..caff598261 100644
--- a/eo-parser/src/main/java/org/eolang/parser/XeEoListener.java
+++ b/eo-parser/src/main/java/org/eolang/parser/XeEoListener.java
@@ -1103,7 +1103,7 @@ public void enterAname(final EoParser.AnameContext ctx) {
             .prop(
                 "name",
                 String.format(
-                    "OBJ-%d%d",
+                    "OBJ-%d-%d",
                     ctx.getStart().getLine(),
                     ctx.getStart().getCharPositionInLine()
                 )