diff --git a/.ci/build.sh b/.ci/build.sh
index 913617bc8e..84d698bfeb 100755
--- a/.ci/build.sh
+++ b/.ci/build.sh
@@ -103,7 +103,7 @@ for PACKAGE in $BUILD_ORDER; do
   echo "$0: cding to '$PKG_PATH'"
   cd $PKG_PATH
 
-  FUTURE_DEB_NAME=echo "ros-noetic-$PACKAGE" | sed 's/_/-/g'
+  FUTURE_DEB_NAME=$(echo "ros-noetic-$PACKAGE" | sed 's/_/-/g')
 
   echo "$0: future deb name: $FUTURE_DEB_NAME"