diff --git a/modules/audio_conference_mixer.target.darwin-arm.mk b/modules/audio_conference_mixer.target.darwin-arm.mk
index 1c81635..dba8b9e 100644
--- a/modules/audio_conference_mixer.target.darwin-arm.mk
+++ b/modules/audio_conference_mixer.target.darwin-arm.mk
@@ -101,6 +101,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DWEBRTC_RESTRICT_LOGGING' \
 	'-DWEBRTC_MODULE_UTILITY_VIDEO' \
@@ -223,6 +224,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DWEBRTC_RESTRICT_LOGGING' \
 	'-DWEBRTC_MODULE_UTILITY_VIDEO' \