diff --git a/src/base64.c b/src/base64.c
index 5778a3e..86ef816 100644
--- a/src/base64.c
+++ b/src/base64.c
@@ -3,8 +3,7 @@
 #include <stdint.h>
 
 // Encode table.
-static const char cb64[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstu \
-                            vwxyz0123456789+/";
+static const char cb64[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 // Decode table.
 #define B64(_)            \
   ((_) == 'A' ? 0         \
@@ -189,13 +188,13 @@ char* base64_encode(size_t* len, char* src, size_t sz) {
 
 // Decode the buffer, same syntax as base64_encode.
 inline int dec_valid(char inp) {
-  if(cd64[inp] == -1)
+  if(cd64[(int)inp] == -1)
     return 0;
   return 1;
 }
 
 inline char dec_ch(char inp) {
-  return cd64[inp];
+  return cd64[(int)inp];
 }
 
 char* base64_decode(size_t* len, char* src, size_t sz) {