diff --git a/OvmfPkg/build.sh b/OvmfPkg/build.sh
index 4fcbdd2bc9..e94aa2a37e 100755
--- a/OvmfPkg/build.sh
+++ b/OvmfPkg/build.sh
@@ -40,7 +40,7 @@ ARCH_X64=no
 BUILDTARGET=DEBUG
 BUILD_OPTIONS=
 PLATFORMFILE=
-THREADNUMBER=1
+THREADNUMBER=0
 LAST_ARG=
 RUN_QEMU=no
 ENABLE_FLASH=no