diff --git a/tests/checksums b/tests/checksums
index b04ac9f5..20bb735a 100755
--- a/tests/checksums
+++ b/tests/checksums
@@ -99,7 +99,7 @@ $topDir/multi_test DB_HDF5 1>/dev/null 2>&1
 #
 offset=0
 skip=0
-while [[ $offset -eq 0 && $skip -lt 9 ]]; do
+while [ $offset -eq 0 && $skip -lt 9 ]; do
     offset=`od -j $skip -A d4 -t d4 h5_check_files/multi_ucd3d.h5 | tr '\t' ' ' | tr -s ' ' | grep '167 179 323 311' | cut -d' ' -f1`
     offset=`echo $offset | cut -d' ' -f1 | sed 's/^0*//'`
     skip=$(expr $skip + 1)