diff --git a/llvm/utils/release/test-release.sh b/llvm/utils/release/test-release.sh
--- a/llvm/utils/release/test-release.sh
+++ b/llvm/utils/release/test-release.sh
@@ -306,6 +306,11 @@
   check_program_exists 'objdump'
 fi
 
+venv=virtualenv
+if ! type -P 'virtualenv' > /dev/null 2>&1 ; then
+  check_program_exists 'python3'
+  venv="python3 -m venv"
+fi
 check_program_exists ${MAKE}
 
 # Export sources to the build directory.
@@ -500,7 +505,7 @@
   TestSuiteBuildDir="$BuildDir/test-suite-build"
   TestSuiteSrcDir="$BuildDir/llvm-test-suite"
 
-  virtualenv $SandboxDir
+  ${venv} $SandboxDir
   $SandboxDir/bin/python $BuildDir/llvm-project/llvm/utils/lit/setup.py install
   mkdir -p $TestSuiteBuildDir
 fi