gistfile.txt

diff --git a/src/string_bytes.cc b/src/string_bytes.cc
index 5bf0a30..d68e3bc 100644
--- a/src/string_bytes.cc
+++ b/src/string_bytes.cc
@@ -63,8 +63,6 @@ static inline size_t base64_decoded_size_fast(size_t size) {
 }
 
 static inline size_t base64_decoded_size(const char* src, size_t size) {
-  size = base64_decoded_size_fast(size);
-
   const char* end = src + size;
   // check for trailing padding (1 or 2 bytes)
   if (size > 0) {
@@ -72,6 +70,8 @@ static inline size_t base64_decoded_size(const char* src, size_t size) {
     if (size > 0 && end[-2] == '=') size--;
   }
 
+  size = base64_decoded_size_fast(size);
+
   return size;
 }