diff --git a/src/Base64EncoderDecoder.cpp b/src/Base64EncoderDecoder.cpp
index 549600e..ec0e3ec 100644
--- a/src/Base64EncoderDecoder.cpp
+++ b/src/Base64EncoderDecoder.cpp
@@ -63,22 +63,22 @@ std::vector<float> Base64EncoderDecoder::decode(const std::string &input)
auto decodeChar = [&](char c) {
constexpr std::array<char, 256> base64CharMap = {{
/* Initialize with -1 for characters not in base64Chars */
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, 62, -1, -1, -1, 63,
+ (char)-1, (char)-1, (char)-1, (char)-1, (char)-1, (char)-1, (char)-1, (char)-1,
+ (char)-1, (char)-1, (char)-1, (char)-1, (char)-1, (char)-1, (char)-1, (char)-1,
+ (char)-1, (char)-1, (char)-1, (char)-1, (char)-1, (char)-1, (char)-1, (char)-1,
+ (char)-1, (char)-1, (char)-1, (char)-1, (char)-1, (char)-1, (char)-1, (char)-1,
+ (char)-1, (char)-1, (char)-1, (char)-1, (char)-1, (char)-1, (char)-1, (char)-1,
+ (char)-1, (char)-1, (char)-1, 62, (char)-1, (char)-1, (char)-1, 63,
52, 53, 54, 55, 56, 57, 58, 59,
- 60, 61, -1, -1, -1, -1, -1, -1,
- -1, 0, 1, 2, 3, 4, 5, 6,
+ 60, 61, (char)-1, (char)-1, (char)-1, (char)-1, (char)-1, (char)-1,
+ (char)-1, 0, 1, 2, 3, 4, 5, 6,
7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22,
- 23, 24, 25, -1, -1, -1, -1, -1,
- -1, 26, 27, 28, 29, 30, 31, 32,
+ 23, 24, 25, (char)-1, (char)-1, (char)-1, (char)-1, (char)-1,
+ (char)-1, 26, 27, 28, 29, 30, 31, 32,
33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48,
- 49, 50, 51, -1, -1, -1, -1, -1
+ 49, 50, 51, (char)-1, (char)-1, (char)-1, (char)-1, (char)-1
}};
return static_cast<unsigned char>(base64CharMap[static_cast<unsigned char>(c)]);
};