diff --git a/evocheck.sh b/evocheck.sh
index 4364a2a..cefeb03 100755
--- a/evocheck.sh
+++ b/evocheck.sh
@@ -607,8 +607,12 @@ if [ -e /etc/debian_version ]; then
 
     if [ "$IS_BACKPORTSCONF" = 1 ]; then
         if is_debianversion stretch; then
-            grep -qE "^[^#].*backports" /etc/apt/sources.list && echo 'IS_BACKPORTSCONF FAILED!'
-            grep -qE "^[^#].*backports" /etc/apt/sources.list.d/*.list 2>/dev/null && (grep -qE "^[^#].*backports" /etc/apt/preferences.d/* || echo 'IS_BACKPORTSCONF FAILED!')
+            grep -qsE "^[^#].*backports" /etc/apt/sources.list \
+              && echo 'IS_BACKPORTSCONF FAILED!'
+            if grep -qsE "^[^#].*backports" /etc/apt/sources.list.d/*.list; then
+                grep -qsE "^[^#].*backports" /etc/apt/preferences.d/* \
+                  || echo 'IS_BACKPORTSCONF FAILED!'
+            fi
         fi
     fi