diff --git a/CycloneDX.Core/Services/ProjectFileService.cs b/CycloneDX.Core/Services/ProjectFileService.cs
index cdc78621..c87fdec3 100644
--- a/CycloneDX.Core/Services/ProjectFileService.cs
+++ b/CycloneDX.Core/Services/ProjectFileService.cs
@@ -232,8 +232,11 @@ public async Task<HashSet<string>> RecursivelyGetProjectReferencesAsync(string p
                 {
                     if (!visitedProjectFiles.Contains(projectReferencePath))
                     {
-                        files.Enqueue(projectReferencePath);
-                        projectReferences.Add(projectReferencePath);
+                        if (Core.Utils.IsSupportedProjectType(projectReferencePath))
+                        {
+                            files.Enqueue(projectReferencePath);
+                            projectReferences.Add(projectReferencePath);
+                        }
                     }
                 }
 
@@ -244,4 +247,4 @@ public async Task<HashSet<string>> RecursivelyGetProjectReferencesAsync(string p
             return projectReferences;
         }
     }
-}
\ No newline at end of file
+}