diff --git a/configure.in b/configure.in
index 7cca03cb97..c024e45f0d 100644
--- a/configure.in
+++ b/configure.in
@@ -1229,7 +1229,7 @@ dnl does make support "-include" (only GNU make does AFAIK)?
 AC_CACHE_CHECK([if make is GNU make], wx_cv_prog_makeisgnu,
 [
     if ( ${SHELL-sh} -c "${MAKE-make} --version" 2> /dev/null |
-            egrep qs GNU > /dev/null); then
+            egrep -s GNU > /dev/null); then
         wx_cv_prog_makeisgnu="yes"
     else
         wx_cv_prog_makeisgnu="no"