diff --git a/source/utf8/checked.h b/source/utf8/checked.h
index 88fe73e..16bab4d 100644
--- a/source/utf8/checked.h
+++ b/source/utf8/checked.h
@@ -117,13 +117,13 @@ namespace utf8
         }
         else if (cp < 0x10000) {              // three octets
             *(result++) = static_cast<uint8_t>((cp >> 12)           | 0xe0);
-            *(result++) = static_cast<uint8_t>((cp >> 6) & 0x3f     | 0x80);
+            *(result++) = static_cast<uint8_t>(((cp >> 6) & 0x3f)   | 0x80);
             *(result++) = static_cast<uint8_t>((cp & 0x3f)          | 0x80);
         }
         else if (cp <= internal::CODE_POINT_MAX) {      // four octets
             *(result++) = static_cast<uint8_t>((cp >> 18)           | 0xf0);
-            *(result++) = static_cast<uint8_t>((cp >> 12)& 0x3f     | 0x80);
-            *(result++) = static_cast<uint8_t>((cp >> 6) & 0x3f     | 0x80);
+            *(result++) = static_cast<uint8_t>(((cp >> 12) & 0x3f)  | 0x80);
+            *(result++) = static_cast<uint8_t>(((cp >> 6) & 0x3f)   | 0x80);
             *(result++) = static_cast<uint8_t>((cp & 0x3f)          | 0x80);
         }
         else
diff --git a/source/utf8/unchecked.h b/source/utf8/unchecked.h
index 4009ceb..84207a5 100644
--- a/source/utf8/unchecked.h
+++ b/source/utf8/unchecked.h
@@ -45,13 +45,13 @@ namespace utf8
             }
             else if (cp < 0x10000) {              // three octets
                 *(result++) = static_cast<uint8_t>((cp >> 12)         | 0xe0);
-                *(result++) = static_cast<uint8_t>((cp >> 6) & 0x3f   | 0x80);
+                *(result++) = static_cast<uint8_t>(((cp >> 6) & 0x3f) | 0x80);
                 *(result++) = static_cast<uint8_t>((cp & 0x3f)        | 0x80);
             }
             else {                                // four octets
                 *(result++) = static_cast<uint8_t>((cp >> 18)         | 0xf0);
-                *(result++) = static_cast<uint8_t>((cp >> 12)& 0x3f   | 0x80);
-                *(result++) = static_cast<uint8_t>((cp >> 6) & 0x3f   | 0x80);
+                *(result++) = static_cast<uint8_t>(((cp >> 12) & 0x3f)| 0x80);
+                *(result++) = static_cast<uint8_t>(((cp >> 6) & 0x3f) | 0x80);
                 *(result++) = static_cast<uint8_t>((cp & 0x3f)        | 0x80);
             }
             return result;