diff --git a/powerpc/run b/powerpc/run
index 172f32a..27abf1e 100755
--- a/powerpc/run
+++ b/powerpc/run
@@ -36,8 +36,8 @@
 	exit 2
 fi
 
+A="-accel $ACCEL$ACCEL_PROPS"
 M="-machine $MACHINE"
-M+=",accel=$ACCEL$ACCEL_PROPS"
 B=""
 D=""
 
@@ -54,7 +54,7 @@
 	D+="-device ipmi-bmc-sim,id=bmc0 -device isa-ipmi-bt,bmc=bmc0,irq=10"
 fi
 
-command="$qemu -nodefaults $M $B $D"
+command="$qemu -nodefaults $A $M $B $D"
 command+=" -display none -serial stdio -kernel"
 command="$(migration_cmd) $(timeout_cmd) $command"
 
diff --git a/powerpc/unittests.cfg b/powerpc/unittests.cfg
index aa707e0..5c45899 100644
--- a/powerpc/unittests.cfg
+++ b/powerpc/unittests.cfg
@@ -77,6 +77,12 @@
 file = smp.elf
 smp = 8,threads=4
 
+# mttcg is the default most places, so add a thread=single test
+[smp-thread-single]
+file = smp.elf
+smp = 8,threads=4
+accel = tcg,thread=single
+
 [h_cede_tm]
 file = tm.elf
 machine = pseries