diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
index a7fe056..2998bb2 100644
--- a/src/core/ngx_resolver.c
+++ b/src/core/ngx_resolver.c
@@ -1836,7 +1836,7 @@
         }
 
         if (n & 0xc0) {
-            n = (n & 0x3f << 8) + *p;
+            n = ((n & 0x3f) << 8) + *p;
             p = &buf[n];
 
         } else {
@@ -1886,7 +1886,7 @@
             }
 
         } else {
-            n = (n & 0x3f << 8) + *src;
+            n = ((n & 0x3f) << 8) + *src;
             src = &buf[n];
 
             n = *src++;