diff --git a/src/collectors/definitions.cpp b/src/collectors/definitions.cpp
index 5dfb45a..a651e5f 100644
--- a/src/collectors/definitions.cpp
+++ b/src/collectors/definitions.cpp
@@ -25,15 +25,19 @@ class DefinitionsDataAppender : public MatchFinder::MatchCallback {
 
     clang::SourceManager *sm = r.SourceManager;
     const clang::FileID fid = sm->getFileID(e->getLocation());
-    const clang::FileEntry *entry = sm->getFileEntryForID(fid);
 #if LLVM_VERSION_MAJOR >= 15
-    if (!entry) {
+    const llvm::Optional<clang::FileEntryRef> entry = sm->getFileEntryRefForID(fid);
+    if (!entry.has_value()) {
+      return;
+    }
+    const types::FileUID fuid = entry.value().getUID();
 #else
+    const clang::FileEntry *entry = sm->getFileEntryForID(fid);
     if (!(entry && entry->isValid())) {
-#endif
       return;
     }
     const types::FileUID fuid = entry->getUID();
+#endif
 
     data->defs.insert(
         std::pair<types::FileUID, const clang::NamedDecl *>(fuid, e));