diff --git a/util/dist-check b/util/dist-check
index 970ca3a..9e76706 100755
--- a/util/dist-check
+++ b/util/dist-check
@@ -39,7 +39,7 @@ unless ($opts{f}) {
 sh "$make -j$jobs > /dev/null";
 sh "sudo $make install > /dev/null";
 sh "$prefix/nginx/sbin/nginx -V 2>&1 |grep $ver";
-system "sudo killall nginx";
+system "sudo killall nginx > /dev/null 2>&1";
 sh "sudo $prefix/nginx/sbin/nginx";
 sh "curl -si localhost/lua|grep LuaJIT";
 sh "curl -si localhost/lua|grep $ver";
@@ -54,7 +54,7 @@ sh "$make -j$jobs > /dev/null";
 sh "sudo $make install > /dev/null";
 sh "$prefix/nginx/sbin/nginx -V 2>&1 |grep $ver";
 sh "$prefix/nginx/sbin/nginx -V 2>&1 |grep '\\--with-debug'";
-system "sudo killall nginx";
+system "sudo killall nginx > /dev/null 2>&1";
 sh "sudo $prefix/nginx/sbin/nginx";
 sh "curl -si localhost/lua|grep LuaJIT";
 sh "curl -si localhost/lua|grep $ver";
@@ -69,7 +69,7 @@ sh "$make -j$jobs > /dev/null";
 sh "sudo $make install > /dev/null";
 sh "$prefix/nginx/sbin/nginx -V 2>&1 |grep $ver";
 sh "$prefix/nginx/sbin/nginx -V 2>&1 |grep '\\--with-dtrace-probes'";
-system "sudo killall nginx";
+system "sudo killall nginx > /dev/null 2>&1";
 sh "sudo $prefix/nginx/sbin/nginx";
 sh "curl -si localhost/lua|grep LuaJIT";
 sh "curl -si localhost/lua|grep $ver";