diff --git a/docker/files/opt/do.sh b/docker/files/opt/do.sh
index 20840257..7d960786 100755
--- a/docker/files/opt/do.sh
+++ b/docker/files/opt/do.sh
@@ -19,7 +19,7 @@ function compile-module {
   fi
   echo "Compiling module for ${PLATFORM}-${KVER}..."
   cp -R /input /tmp
-  make -C "/opt/${PLATFORM}" M="/tmp/input" modules
+  make -C "/opt/${PLATFORM}" M="/tmp/input" PLATFORM=${PLATFORM^^} modules
   while read F; do
     strip -g "${F}"
     echo "Copying `basename ${F}`"