diff --git a/llvm/lib/ProfileData/InstrProfWriter.cpp b/llvm/lib/ProfileData/InstrProfWriter.cpp
index 72d77d5580a5..1e0159dd1e6f 100644
--- a/llvm/lib/ProfileData/InstrProfWriter.cpp
+++ b/llvm/lib/ProfileData/InstrProfWriter.cpp
@@ -493,7 +493,7 @@ static Error writeMemProfV1(
     llvm::MapVector<GlobalValue::GUID, memprof::IndexedMemProfRecord>
         &MemProfRecordData,
     llvm::MapVector<memprof::FrameId, memprof::Frame> &MemProfFrameData) {
-  OS.write(memprof::Version0);
+  OS.write(memprof::Version1);
   uint64_t HeaderUpdatePos = OS.tell();
   OS.write(0ULL); // Reserve space for the memprof record table offset.
   OS.write(0ULL); // Reserve space for the memprof frame payload offset.
diff --git a/llvm/test/tools/llvm-profdata/memprof-merge-v0.test b/llvm/test/tools/llvm-profdata/memprof-merge-v0.test
new file mode 100644
index 000000000000..68132961eb78
--- /dev/null
+++ b/llvm/test/tools/llvm-profdata/memprof-merge-v0.test
@@ -0,0 +1,22 @@
+REQUIRES: x86_64-linux
+
+RUN: echo ":ir" > %t.proftext
+RUN: echo "main" >> %t.proftext
+RUN: echo "742261418966908927" >> %t.proftext
+RUN: echo "1" >> %t.proftext
+RUN: echo "1" >> %t.proftext
+
+To update the inputs used below run Inputs/update_memprof_inputs.sh /path/to/updated/clang
+RUN: llvm-profdata merge %t.proftext %p/Inputs/basic.memprofraw --memprof-version=0 --profiled-binary %p/Inputs/basic.memprofexe -o %t.prof.v0
+RUN: llvm-profdata show %t.prof.v0 | FileCheck %s
+
+RUN: llvm-profdata merge %t.proftext %p/Inputs/basic.memprofraw --memprof-version=1 --profiled-binary %p/Inputs/basic.memprofexe -o %t.prof.v1
+RUN: llvm-profdata show %t.prof.v1 | FileCheck %s
+
+For now we only check the validity of the instrumented profile since we don't
+have a way to display the contents of the memprof indexed format yet.
+
+CHECK: Instrumentation level: IR  entry_first = 0
+CHECK: Total functions: 1
+CHECK: Maximum function count: 1
+CHECK: Maximum internal block count: 0