diff --git a/collects/meta/build/build b/collects/meta/build/build
index 750fd03bde..be0284b422 100755
--- a/collects/meta/build/build
+++ b/collects/meta/build/build
@@ -2016,7 +2016,7 @@ BUILD_WEB() {
     separator "Making web content -- not distributing"
   fi
   GIT_DIR="$maindir/$cleandir/.git" \
-  KNOWN_MIRRORS_FILE="$maindir/$knownmirrors"
+  KNOWN_MIRRORS_FILE="$maindir/$knownmirrors" \
     _run "$PLTHOME/$webscript" $webflags
 
 }