diff --git a/.ci/get_build_matrix.sh b/.ci/get_build_matrix.sh
index abbdc9e60e..45d256a734 100755
--- a/.ci/get_build_matrix.sh
+++ b/.ci/get_build_matrix.sh
@@ -56,17 +56,19 @@ BUILD_ORDER=$(catkin list -u)
 
 FIRST=true
 
+RESULT='{"matrix": ['
+
 for PACKAGE in $BUILD_ORDER; do
 
   if $FIRST; then
-    RESULT="[$PACKAGE"
+    RESULT=$RESULT\"$PACKAGE\"
     FIRST=false
   else
-    RESULT="$RESULT, $PACKAGE"
+    RESULT="$RESULT, \"$PACKAGE\""
   fi
 
 done
 
-RESULT="$RESULT]"
+RESULT="$RESULT]}"
 
 echo $RESULT