diff --git a/maven-model-builder/src/main/java/org/apache/maven/model/building/ArtifactModelSource.java b/maven-model-builder/src/main/java/org/apache/maven/model/building/ArtifactModelSource.java
index 3351290dafb8..ca8a1bf103b0 100644
--- a/maven-model-builder/src/main/java/org/apache/maven/model/building/ArtifactModelSource.java
+++ b/maven-model-builder/src/main/java/org/apache/maven/model/building/ArtifactModelSource.java
@@ -81,4 +81,9 @@ public boolean equals(Object obj) {
                 && Objects.equals(groupId, other.groupId)
                 && Objects.equals(version, other.version);
     }
+
+    @Override
+    public String toString() {
+        return groupId + ":" + artifactId + ":" + version;
+    }
 }