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-rw-r--r--src/libstore/nar-accessor.cc3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/libstore/nar-accessor.cc b/src/libstore/nar-accessor.cc
index ded19c05d2cd..4cb5de7449ea 100644
--- a/src/libstore/nar-accessor.cc
+++ b/src/libstore/nar-accessor.cc
@@ -52,8 +52,9 @@ struct NarIndexer : ParseSink, StringSource
     void preallocateContents(unsigned long long size) override
     {
         currentStart = string(s, pos, 16);
+        assert(size <= std::numeric_limits<size_t>::max());
         members.emplace(currentPath,
-            NarMember{FSAccessor::Type::tRegular, isExec, pos, size});
+            NarMember{FSAccessor::Type::tRegular, isExec, pos, (size_t) size});
     }
 
     void receiveContents(unsigned char * data, unsigned int len) override