diff --git a/build.sh b/build.sh
index e529a66..ef9ce68 100755
--- a/build.sh
+++ b/build.sh
@@ -18,6 +18,7 @@ fi
 cd circle-stdlib/
 make mrproper || true
 ./configure -r ${RPI} --prefix "${TOOLCHAIN_PREFIX}"
+echo "DEFINE += -DUSE_PWM_AUDIO_ON_ZERO" >> libs/circle/Config.mk
 echo "DEFINE += -DSAVE_VFP_REGS_ON_IRQ" >> libs/circle/Config.mk
 echo "DEFINE += -DREALTIME" >> libs/circle/Config.mk
 make -j