diff --git a/src/base64.c b/src/base64.c
index 7bc3fa02..c4c26316 100644
--- a/src/base64.c
+++ b/src/base64.c
@@ -37,7 +37,7 @@ static const signed char base64_url_reverse_table[] = {
 	41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1, /* 0x70 - 0x7F */
 };
 
-static size_t li_base64_dec(unsigned char * const result, const size_t out_length, const char * const in, const size_t in_length, const base64_charset charset) {
+size_t li_base64_dec(unsigned char * const result, const size_t out_length, const char * const in, const size_t in_length, const base64_charset charset) {
     size_t i;
     const signed char * const base64_reverse_table = (charset)
       ? base64_url_reverse_table                     /* BASE64_URL */
diff --git a/src/base64.h b/src/base64.h
index 5b1cf415..b63777f0 100644
--- a/src/base64.h
+++ b/src/base64.h
@@ -9,6 +9,8 @@ typedef enum {
 	BASE64_URL,
 } base64_charset;
 
+size_t li_base64_dec(unsigned char *result, size_t out_length, const char *in, size_t in_length, base64_charset charset);
+
 unsigned char* buffer_append_base64_decode(buffer *out, const char* in, size_t in_length, base64_charset charset);
 
 size_t li_base64_enc(char* restrict out, size_t out_length, const unsigned char* restrict in, size_t in_length, base64_charset charset, int pad);