diff --git a/src/libstore/include/nix/store/path-references.hh b/src/libstore/include/nix/store/path-references.hh
index fad1e57a3..55535f666 100644
--- a/src/libstore/include/nix/store/path-references.hh
+++ b/src/libstore/include/nix/store/path-references.hh
@@ -6,8 +6,6 @@
 
 namespace nix {
 
-std::pair<StorePathSet, HashResult> scanForReferences(const Path & path, const StorePathSet & refs);
-
 StorePathSet scanForReferences(Sink & toTee, const Path & path, const StorePathSet & refs);
 
 class PathRefScanSink : public RefScanSink
diff --git a/src/libstore/path-references.cc b/src/libstore/path-references.cc
index 2c71f437f..8b167e902 100644
--- a/src/libstore/path-references.cc
+++ b/src/libstore/path-references.cc
@@ -43,14 +43,6 @@ StorePathSet PathRefScanSink::getResultPaths()
     return found;
 }
 
-std::pair<StorePathSet, HashResult> scanForReferences(const std::string & path, const StorePathSet & refs)
-{
-    HashSink hashSink{HashAlgorithm::SHA256};
-    auto found = scanForReferences(hashSink, path, refs);
-    auto hash = hashSink.finish();
-    return std::pair<StorePathSet, HashResult>(found, hash);
-}
-
 StorePathSet scanForReferences(Sink & toTee, const Path & path, const StorePathSet & refs)
 {
     PathRefScanSink refsSink = PathRefScanSink::fromPaths(refs);