diff --git a/src/util/stringutil.cpp b/src/util/stringutil.cpp
index 927e998f..29bd6a1f 100644
--- a/src/util/stringutil.cpp
+++ b/src/util/stringutil.cpp
@@ -37,22 +37,22 @@ wstring util::rfill(wstring s, uint length, wchar_t c) {
 
 uint util::encode_utf8(uint32_t c, ubyte* bytes) {
     if (c < 0x80) {
-        bytes[0] = c >> 0 & 0x7F | 0x00;
+        bytes[0] = ((c >> 0) & 0x7F) | 0x00;
         return 1;
     } else if (c < 0x0800) {
-        bytes[0] = c >> 6 & 0x1F | 0xC0;
-        bytes[1] = c >> 0 & 0x3F | 0x80;
+        bytes[0] = ((c >> 6) & 0x1F) | 0xC0;
+        bytes[1] = ((c >> 0) & 0x3F) | 0x80;
         return 2;
     } else if (c < 0x010000) {
-        bytes[0] = c >> 12 & 0x0F | 0xE0;
-        bytes[1] = c >> 6 & 0x3F | 0x80;
-        bytes[2] = c >> 0 & 0x3F | 0x80;
+        bytes[0] = ((c >> 12) & 0x0F) | 0xE0;
+        bytes[1] = ((c >> 6) & 0x3F) | 0x80;
+        bytes[2] = ((c >> 0) & 0x3F) | 0x80;
         return 3;
     } else {
-        bytes[0] = c >> 18 & 0x07 | 0xF0;
-        bytes[1] = c >> 12 & 0x3F | 0x80;
-        bytes[2] = c >> 6 & 0x3F | 0x80;
-        bytes[3] = c >> 0 & 0x3F | 0x80;
+        bytes[0] = ((c >> 18) & 0x07) | 0xF0;
+        bytes[1] = ((c >> 12) & 0x3F) | 0x80;
+        bytes[2] = ((c >> 6) & 0x3F) | 0x80;
+        bytes[3] = ((c >> 0) & 0x3F) | 0x80;
         return 4;
     }
 }