1 files changed, 4 insertions, 4 deletions
diff --git a/src/string_utils.h b/src/string_utils.h
index ac2b40c5..a5dad100 100644
--- a/src/string_utils.h
+++ b/src/string_utils.h
@@ -84,7 +84,7 @@ is_print(const int c)
 }
 
 static inline bool
-is_base64(const uint8_t c)
+is_base64(const int c)
 {
   return is_alpha(c) || is_digit(c) || c == '+' || c == '/' || c == '=';
 }
@@ -146,9 +146,9 @@ utf8_num_bytes(const uint8_t c)
 static inline uint32_t
 parse_counted_utf8_char(const uint8_t* utf8, size_t size)
 {
-  uint32_t c = utf8[0] & ((1u << (8 - size)) - 1);
+  uint32_t c = utf8[0] & ((1u << (8u - size)) - 1u);
   for (size_t i = 1; i < size; ++i) {
-    const uint8_t in = utf8[i] & 0x3F;
+    const uint8_t in = utf8[i] & 0x3Fu;
     c                = (c << 6) | in;
   }
   return c;
@@ -166,7 +166,7 @@ parse_utf8_char(const uint8_t* utf8, size_t* size)
     return parse_counted_utf8_char(utf8, *size);
   default:
     *size = 0;
-    return 0;
+    return 0u;
   }
 }