diff --git a/src/sled/strings/base64_decode.inc b/src/sled/strings/base64_decode.inc
index 1ac687b..0e16b95 100644
--- a/src/sled/strings/base64_decode.inc
+++ b/src/sled/strings/base64_decode.inc
@@ -12,7 +12,7 @@ base64_decode_value(char value_in)
         = {62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -2, -1, -1, -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, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51};
-    static const size_t decoding_size = sizeof(decoding);
+    static const int decoding_size = sizeof(decoding) / sizeof(int);
     value_in -= 43;
     if (value_in < 0 || value_in > decoding_size) return -1;
     return decoding[(int) value_in];