diff --git a/recipes-fixes/dropbear/files/init b/recipes-fixes/dropbear/files/init
index 8b99ecb..c1747e7 100644
--- a/recipes-fixes/dropbear/files/init
+++ b/recipes-fixes/dropbear/files/init
@@ -58,13 +58,13 @@ gen_keys() {
 for t in $DROPBEAR_KEYTYPES; do
   case $t in
     rsa)
-        if [ ! -s $DROPBEAR_RSAKEY ]; then
+        if [ -f "$DROPBEAR_RSAKEY" -a ! -s "$DROPBEAR_RSAKEY" ]; then
                 rm $DROPBEAR_RSAKEY
         fi
         test -f $DROPBEAR_RSAKEY || dropbearkey -t rsa -f $DROPBEAR_RSAKEY
         ;;
     dsa)
-        if [ ! -s $DROPBEAR_DSSKEY ]; then
+        if [ -f "$DROPBEAR_DSSKEY" -a ! -s "$DROPBEAR_DSSKEY" ]; then
                 rm $DROPBEAR_DSSKEY
         fi
         test -f $DROPBEAR_DSSKEY || dropbearkey -t dss -f $DROPBEAR_DSSKEY