diff --git a/aux/qemu_amd64.sh b/aux/qemu_amd64.sh
index 7213bc7..35e3145 100755
--- a/aux/qemu_amd64.sh
+++ b/aux/qemu_amd64.sh
@@ -5,6 +5,7 @@ set -x
 POSITIONAL_ARGS=()
 
 QEMU_EXTRA=""
+ENABLE_KVM=1
 
 while [[ $# -gt 0 ]]; do
   case $1 in
@@ -24,6 +25,7 @@ while [[ $# -gt 0 ]]; do
       ;;
     --debug)
       QEMU_EXTRA+=" -s -S "
+      ENABLE_KVM=0
       shift
       ;;
     --uefi)
@@ -38,5 +40,7 @@ while [[ $# -gt 0 ]]; do
   esac
 done
 
-qemu-system-x86_64 -M pc -m 4G -serial stdio -enable-kvm \
-  -cdrom mop3.iso -smp 4 -boot d $QEMU_EXTRA "${POSITIONAL_ARGS[@]}"
+[ "$ENABLE_KVM" -eq 1 ] && KVM_FLAG="-enable-kvm" || KVM_FLAG=""
+
+qemu-system-x86_64 -M pc -m 4G -serial stdio $KVM_FLAG \
+  -cdrom mop3.iso -smp 1 -boot d $QEMU_EXTRA "${POSITIONAL_ARGS[@]}"