diff --git a/contrib/guix/libexec/build.sh b/contrib/guix/libexec/build.sh
index 1ee1d4d6c9..cfb8a88c91 100755
--- a/contrib/guix/libexec/build.sh
+++ b/contrib/guix/libexec/build.sh
@@ -49,7 +49,8 @@ BASEPREFIX="${PWD}/depends"
 store_path() {
     grep --extended-regexp "/[^-]{32}-${1}-[^-]+${2:+-${2}}" "${GUIX_ENVIRONMENT}/manifest" \
         | head --lines=1 \
-        | sed --expression='s|^[[:space:]]*"||' \
+        | sed --expression='s|\x29*$||' \
+              --expression='s|^[[:space:]]*"||' \
               --expression='s|"[[:space:]]*$||'
 }