diff --git a/builder.dockerfile b/builder.dockerfile
index 960f884..42156ab 100644
--- a/builder.dockerfile
+++ b/builder.dockerfile
@@ -15,6 +15,7 @@ RUN echo 'deb http://deb.debian.org/debian testing main' \
 		subversion \
 		libncurses5-dev \
 		gawk \
+		gcc-multilib \
 		unzip \
 		pv \
 		gosu \