diff --git a/examples/base64.c b/examples/base64.c
index cdb89aafba4be064064c3204872e4c6999653f79..17264da9441d8fb7008496cc901c6a5f471a2db5 100644
--- a/examples/base64.c
+++ b/examples/base64.c
@@ -18,30 +18,30 @@ const HParser* document = NULL;
 void init_parser(void)
 {
     // CORE
-    const HParser *digit = h_ch_range(0x30, 0x39);
-    const HParser *alpha = h_choice(h_ch_range(0x41, 0x5a), h_ch_range(0x61, 0x7a), NULL);
+    HParser *digit = h_ch_range(0x30, 0x39);
+    HParser *alpha = h_choice(h_ch_range(0x41, 0x5a), h_ch_range(0x61, 0x7a), NULL);
 
     // AUX.
-    const HParser *plus = h_ch('+');
-    const HParser *slash = h_ch('/');
-    const HParser *equals = h_ch('=');
+    HParser *plus = h_ch('+');
+    HParser *slash = h_ch('/');
+    HParser *equals = h_ch('=');
 
-    const HParser *bsfdig = h_choice(alpha, digit, plus, slash, NULL);
-    const HParser *bsfdig_4bit = h_choice(
+    HParser *bsfdig = h_choice(alpha, digit, plus, slash, NULL);
+    HParser *bsfdig_4bit = h_choice(
         h_ch('A'), h_ch('E'), h_ch('I'), h_ch('M'), h_ch('Q'), h_ch('U'),
         h_ch('Y'), h_ch('c'), h_ch('g'), h_ch('k'), h_ch('o'), h_ch('s'),
         h_ch('w'), h_ch('0'), h_ch('4'), h_ch('8'), NULL);
-    const HParser *bsfdig_2bit = h_choice(h_ch('A'), h_ch('Q'), h_ch('g'), h_ch('w'), NULL);
+    HParser *bsfdig_2bit = h_choice(h_ch('A'), h_ch('Q'), h_ch('g'), h_ch('w'), NULL);
 
-    const HParser *base64_quad = h_sequence(bsfdig, bsfdig, bsfdig, bsfdig, NULL);
-    const HParser *base64_quads = h_many(base64_quad);
+    HParser *base64_quad = h_sequence(bsfdig, bsfdig, bsfdig, bsfdig, NULL);
+    HParser *base64_quads = h_many(base64_quad);
 
-    const HParser *base64_2 = h_sequence(bsfdig, bsfdig, bsfdig_4bit, equals, h_end_p(), NULL);
-    const HParser *base64_1 = h_sequence(bsfdig, bsfdig_2bit, equals, equals, h_end_p(), NULL);
-    const HParser *base64_ending = h_choice(h_end_p(), base64_2, base64_1, NULL);
-    const HParser *base64 = h_sequence(base64_quads, base64_ending, NULL);
-        // why does this parse "A=="?!
-        // why does this parse "aaA=" but not "aA=="?!
+    HParser *base64_2 = h_sequence(bsfdig, bsfdig, bsfdig_4bit, equals, h_end_p(), NULL);
+    HParser *base64_1 = h_sequence(bsfdig, bsfdig_2bit, equals, equals, h_end_p(), NULL);
+    HParser *base64_ending = h_choice(h_end_p(), base64_2, base64_1, NULL);
+    HParser *base64 = h_sequence(base64_quads, base64_ending, NULL);
+    // why does this parse "A=="?!
+    // why does this parse "aaA=" but not "aA=="?!
 
     document = base64;
 }
@@ -53,7 +53,7 @@ void init_parser(void)
 #define FALSE (0)
 
 void assert_parse(int expected, char *data) {
-    const HParseResult *result;
+    HParseResult *result;
 
     size_t datasize = strlen(data);
     result = h_parse(document, (void*)data, datasize);
@@ -63,7 +63,7 @@ void assert_parse(int expected, char *data) {
 #ifdef DEBUG
     else {
         fprintf(stderr, "Test succeeded: %s\n", data);
-        fprintf(stderr, "parsed=%lld bytes\n", result->bit_length/8);
+        fprintf(stderr, "parsed=%" PRId64 " bytes\n", result->bit_length/8);
         h_pprint(stdout, result->ast, 0, 0);
     }
 #endif
@@ -90,7 +90,7 @@ int main(int argc, char **argv)
 {
     uint8_t input[102400];
     size_t inputsize;
-    const HParseResult *result;
+    HParseResult *result;
 
     init_parser();