diff --git a/scripts/dng.in b/scripts/dng.in
index 41e31bd636c0193f83bb87671df25e0feed39733..d1d7096fca8c777e211d61e462b9d5709844f5f4 100755
--- a/scripts/dng.in
+++ b/scripts/dng.in
@@ -26,6 +26,6 @@ else
   SCRIPT_NAME="$0"
 fi
 BIN_DIR=`dirname "$SCRIPT_NAME"`
-source $BIN_DIR/../@LIBEXEC_PATH@/ost_config
+source "$BIN_DIR/../@LIBEXEC_PATH@/ost_config"
 
 $BIN_DIR/../@LIBEXEC_PATH@/gosty $DNG_INITDIR/init.py dng $opts
diff --git a/scripts/ost.in b/scripts/ost.in
index 407daed10f8d2b6fed92f1724c9c4b369bef0244..bea69d9ec23a36cc1912b9457938c31e8d898ea6 100755
--- a/scripts/ost.in
+++ b/scripts/ost.in
@@ -29,7 +29,7 @@ else
 fi
 BIN_DIR=`dirname "$SCRIPT_NAME"`
 
-source $BIN_DIR/../@LIBEXEC_PATH@/ost_config
+source "$BIN_DIR/../@LIBEXEC_PATH@/ost_config"
 
 $pyexec $interactive "$DNG_ROOT/@LIBDIR@/python@PYTHON_VERSION@/site-packages/init_cl.py" $opts
 RC=$?