diff --git a/configure_build.sh b/configure_build.sh
index 3795f5d..6fe6ff4 100755
--- a/configure_build.sh
+++ b/configure_build.sh
@@ -15,7 +15,7 @@ cp treebird/{config.def.h,config.h}
 
 ln -s ../treebird/config.h ${CONFIG_DIR}
 
-sed -i "/config_instance_url/ s/= .*;/= \"https:\\/\\/${INSTANCE_HOST}\\/\\\"/;\
+sed -i "/config_instance_url/ s/= .*;/= \"https:\\/\\/${INSTANCE_HOST}\\/\\\";/;\
         /config_experimental_lookup/ s/= .*;/= FALSE;/" \
     treebird/config.h