diff --git a/ots.target.darwin-x86_64.mk b/ots.target.darwin-x86_64.mk
index 8dadf0a..dd11e66 100644
--- a/ots.target.darwin-x86_64.mk
+++ b/ots.target.darwin-x86_64.mk
@@ -112,7 +112,8 @@
 	'-DENABLE_PRINTING=1' \
 	'-DENABLE_MANAGED_USERS=1' \
 	'-DDATA_REDUCTION_FALLBACK_HOST="http://compress.googlezip.net:80/"' \
-	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
+	'-DDATA_REDUCTION_DEV_HOST="https://proxy-dev.googlezip.net:443/"' \
+	'-DDATA_REDUCTION_DEV_FALLBACK_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"' \
@@ -208,7 +209,8 @@
 	'-DENABLE_PRINTING=1' \
 	'-DENABLE_MANAGED_USERS=1' \
 	'-DDATA_REDUCTION_FALLBACK_HOST="http://compress.googlezip.net:80/"' \
-	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
+	'-DDATA_REDUCTION_DEV_HOST="https://proxy-dev.googlezip.net:443/"' \
+	'-DDATA_REDUCTION_DEV_FALLBACK_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"' \