diff --git a/core/base/src/TObject.cxx b/core/base/src/TObject.cxx
index 822562351caf6..31416e210744c 100644
--- a/core/base/src/TObject.cxx
+++ b/core/base/src/TObject.cxx
@@ -880,8 +880,9 @@ void TObject::Streamer(TBuffer &R__b)
    if (R__b.IsReading()) {
       R__b.SkipVersion(); // Version_t R__v = R__b.ReadVersion(); if (R__v) { }
       R__b >> fUniqueID;
+      const UInt_t isonheap = fBits & kIsOnHeap; // Record how this instance was actually allocated.
       R__b >> fBits;
-      fBits |= kIsOnHeap;  // by definition de-serialized object is on heap
+      fBits |= isonheap | kNotDeleted;  // by definition de-serialized object are not yet deleted.
       if (TestBit(kIsReferenced)) {
          //if the object is referenced, we must read its old address
          //and store it in the ProcessID map in gROOT
diff --git a/io/io/src/TStreamerInfoActions.cxx b/io/io/src/TStreamerInfoActions.cxx
index a615e44434a09..7cdc0aeab56f5 100644
--- a/io/io/src/TStreamerInfoActions.cxx
+++ b/io/io/src/TStreamerInfoActions.cxx
@@ -236,7 +236,9 @@ namespace TStreamerInfoActions
       UInt_t *x = (UInt_t*)( ((char*)addr) + config->fOffset );
       // Idea: Implement buf.ReadBasic/Primitive to avoid the return value
       // Idea: This code really belongs inside TBuffer[File]
+      const UInt_t isonheap = *x & TObject::kIsOnHeap; // Record how this instance was actually allocated.
       buf >> *x;
+      *x |= isonheap | TObject::kNotDeleted;  // by definition de-serialized object are not yet deleted.
 
       if ((*x & kIsReferenced) != 0) {
          HandleReferencedTObject(buf,addr,config);
diff --git a/io/io/src/TStreamerInfoReadBuffer.cxx b/io/io/src/TStreamerInfoReadBuffer.cxx
index e9054d8d4e26e..5b84e330f9b91 100644
--- a/io/io/src/TStreamerInfoReadBuffer.cxx
+++ b/io/io/src/TStreamerInfoReadBuffer.cxx
@@ -609,6 +609,7 @@ Int_t TStreamerInfo::ReadBufferConv(TBuffer &b, const T &arr,  const TCompInfo *
          DOLOOP {
             UInt_t u;
             b >> u;
+            u |= kNotDeleted;  // by definition de-serialized object are not yet deleted.
             if ((u & kIsReferenced) != 0) {
                UShort_t pidf;
                b >> pidf;
@@ -1019,7 +1020,10 @@ Int_t TStreamerInfo::ReadBuffer(TBuffer &b, const T &arr,
          // special case for TObject::fBits in case of a referenced object
          case TStreamerInfo::kBits: {
             DOLOOP {
-               UInt_t *x=(UInt_t*)(arr[k]+ioffset); b >> *x;
+               UInt_t *x=(UInt_t*)(arr[k]+ioffset);
+               const UInt_t isonheap = *x & TObject::kIsOnHeap; // Record how this instance was actually allocated.
+               b >> *x;
+               *x |= isonheap | TObject::kNotDeleted;  // by definition de-serialized object are not yet deleted.
                if ((*x & kIsReferenced) != 0) {
                   UShort_t pidf;
                   b >> pidf;