diff --git a/contrib/hooks/post_encrypt b/contrib/hooks/post_encrypt
index ffec5d5..a37a8ee 100755
--- a/contrib/hooks/post_encrypt
+++ b/contrib/hooks/post_encrypt
@@ -67,7 +67,7 @@ ensure_algorithm
 echo -n > $YADM_CHECKSUMS
 
 # calculate checksums for encrypted files
-for included in ${YADM_ENCRYPT_INCLUDE_FILES[@]}; do
+for included in "${YADM_ENCRYPT_INCLUDE_FILES[@]}"; do
     shasum --algorithm $CHECKSUM_ALGORITHM $included >> $YADM_CHECKSUMS
 
     # signal errors