diff --git a/DataFormats/PortableTestObjects/BuildFile.xml b/DataFormats/PortableTestObjects/BuildFile.xml
index 872f0713479ab..5a07b29309b12 100644
--- a/DataFormats/PortableTestObjects/BuildFile.xml
+++ b/DataFormats/PortableTestObjects/BuildFile.xml
@@ -4,7 +4,7 @@
 <use name="DataFormats/Portable"/>
 <use name="DataFormats/SoATemplate"/>
 <use name="HeterogeneousCore/AlpakaInterface"/>
-<flags ALPAKA_BACKENDS="1"/>
+<flags ALPAKA_BACKENDS="cuda rocm"/>
 <export>
   <lib name="1"/>
 </export>
diff --git a/DataFormats/PortableTestObjects/src/alpaka/classes_serial.h b/DataFormats/PortableTestObjects/src/alpaka/classes_serial.h
deleted file mode 100644
index b6912da969023..0000000000000
--- a/DataFormats/PortableTestObjects/src/alpaka/classes_serial.h
+++ /dev/null
@@ -1,4 +0,0 @@
-#include "DataFormats/Common/interface/Wrapper.h"
-#include "DataFormats/Portable/interface/Product.h"
-#include "DataFormats/PortableTestObjects/interface/TestHostCollection.h"
-#include "DataFormats/PortableTestObjects/interface/TestSoA.h"
diff --git a/DataFormats/PortableTestObjects/src/alpaka/classes_serial_def.xml b/DataFormats/PortableTestObjects/src/alpaka/classes_serial_def.xml
deleted file mode 100644
index 04e93cb5a6c87..0000000000000
--- a/DataFormats/PortableTestObjects/src/alpaka/classes_serial_def.xml
+++ /dev/null
@@ -1,15 +0,0 @@
-<lcgdict>
-  <class name="portabletest::TestHostCollection"/>
-  <read
-    sourceClass="portabletest::TestHostCollection"
-    targetClass="portabletest::TestHostCollection"
-    version="[1-]"
-    source="portabletest::TestSoA layout_;"
-    target="buffer_,layout_,view_"
-    embed="false">
-  <![CDATA[
-    portabletest::TestHostCollection::ROOTReadStreamer(newObj, onfile.layout_);
-  ]]>
-  </read>
-  <class name="edm::Wrapper<portabletest::TestHostCollection>" splitLevel="0"/>
-</lcgdict>
diff --git a/DataFormats/PortableTestObjects/src/classes.h b/DataFormats/PortableTestObjects/src/classes.h
index 46c07862b7db8..b6912da969023 100644
--- a/DataFormats/PortableTestObjects/src/classes.h
+++ b/DataFormats/PortableTestObjects/src/classes.h
@@ -1 +1,4 @@
+#include "DataFormats/Common/interface/Wrapper.h"
+#include "DataFormats/Portable/interface/Product.h"
+#include "DataFormats/PortableTestObjects/interface/TestHostCollection.h"
 #include "DataFormats/PortableTestObjects/interface/TestSoA.h"
diff --git a/DataFormats/PortableTestObjects/src/classes_def.xml b/DataFormats/PortableTestObjects/src/classes_def.xml
index e1f021f9d6b5b..3470c65a70c23 100644
--- a/DataFormats/PortableTestObjects/src/classes_def.xml
+++ b/DataFormats/PortableTestObjects/src/classes_def.xml
@@ -1,4 +1,18 @@
 <lcgdict>
   <class name="portabletest::TestSoA"/>
   <class name="portabletest::TestSoA::View"/>
+
+  <class name="portabletest::TestHostCollection"/>
+  <read
+    sourceClass="portabletest::TestHostCollection"
+    targetClass="portabletest::TestHostCollection"
+    version="[1-]"
+    source="portabletest::TestSoA layout_;"
+    target="buffer_,layout_,view_"
+    embed="false">
+  <![CDATA[
+    portabletest::TestHostCollection::ROOTReadStreamer(newObj, onfile.layout_);
+  ]]>
+  </read>
+  <class name="edm::Wrapper<portabletest::TestHostCollection>" splitLevel="0"/>
 </lcgdict>