diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index a28bb2101..3b0fe93e1 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -2329,7 +2329,7 @@ StorePath EvalState::copyPathToStore(NixStringContext & context, const SourcePat
     auto dstPath = i != srcToStore.end()
         ? i->second
         : [&]() {
-            auto dstPath = path.fetchToStore(store, path.baseName(), nullptr, repair);
+            auto dstPath = path.fetchToStore(store, path.baseName(), FileIngestionMethod::Recursive, nullptr, repair);
             allowPath(dstPath);
             srcToStore.insert_or_assign(path, dstPath);
             printMsg(lvlChatty, "copied source '%1%' -> '%2%'", path, store->printStorePath(dstPath));
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index f1c24a75c..f416aa639 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -2233,10 +2233,7 @@ static void addPath(
             });
 
         if (!expectedHash || !state.store->isValidPath(*expectedStorePath)) {
-            // FIXME
-            if (method != FileIngestionMethod::Recursive)
-                throw Error("'recursive = false' is not implemented");
-            auto dstPath = state.rootPath(CanonPath(path)).fetchToStore(state.store, name, &filter, state.repair);
+            auto dstPath = state.rootPath(CanonPath(path)).fetchToStore(state.store, name, method, &filter, state.repair);
             if (expectedHash && expectedStorePath != dstPath)
                 state.debugThrowLastTrace(Error("store path mismatch in (possibly filtered) path added from '%s'", path));
             state.allowAndSetStorePathString(dstPath, v);
diff --git a/src/libfetchers/input-accessor.cc b/src/libfetchers/input-accessor.cc
index fec16e99f..63f1f4ad2 100644
--- a/src/libfetchers/input-accessor.cc
+++ b/src/libfetchers/input-accessor.cc
@@ -96,6 +96,7 @@ StorePath InputAccessor::fetchToStore(
     ref<Store> store,
     const CanonPath & path,
     std::string_view name,
+    FileIngestionMethod method,
     PathFilter * filter,
     RepairFlag repair)
 {
@@ -107,8 +108,8 @@ StorePath InputAccessor::fetchToStore(
 
     auto storePath =
         settings.readOnlyMode
-        ? store->computeStorePathFromDump(*source, name).first
-        : store->addToStoreFromDump(*source, name, FileIngestionMethod::Recursive, htSHA256, repair);
+        ? store->computeStorePathFromDump(*source, name, method, htSHA256).first
+        : store->addToStoreFromDump(*source, name, method, htSHA256, repair);
 
     return storePath;
 }
@@ -140,10 +141,11 @@ std::ostream & operator << (std::ostream & str, const SourcePath & path)
 StorePath SourcePath::fetchToStore(
     ref<Store> store,
     std::string_view name,
+    FileIngestionMethod method,
     PathFilter * filter,
     RepairFlag repair) const
 {
-    return accessor->fetchToStore(store, path, name, filter, repair);
+    return accessor->fetchToStore(store, path, name, method, filter, repair);
 }
 
 std::string_view SourcePath::baseName() const
diff --git a/src/libfetchers/input-accessor.hh b/src/libfetchers/input-accessor.hh
index a0f08e295..003c7226c 100644
--- a/src/libfetchers/input-accessor.hh
+++ b/src/libfetchers/input-accessor.hh
@@ -6,6 +6,7 @@
 #include "canon-path.hh"
 #include "repair-flag.hh"
 #include "hash.hh"
+#include "content-address.hh"
 
 namespace nix {
 
@@ -73,6 +74,7 @@ struct InputAccessor : public std::enable_shared_from_this<InputAccessor>
         ref<Store> store,
         const CanonPath & path,
         std::string_view name = "source",
+        FileIngestionMethod method = FileIngestionMethod::Recursive,
         PathFilter * filter = nullptr,
         RepairFlag repair = NoRepair);
 
@@ -181,6 +183,7 @@ struct SourcePath
     StorePath fetchToStore(
         ref<Store> store,
         std::string_view name = "source",
+        FileIngestionMethod method = FileIngestionMethod::Recursive,
         PathFilter * filter = nullptr,
         RepairFlag repair = NoRepair) const;