diff --git a/ChangeLog b/ChangeLog
index 8accf533..4b7212a5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -20,6 +20,8 @@
     Changed files: linkchecker
   * added AnsiColors.py and debug.py to split out some functions
     Changed files: a lot .py files using these things
+  * use yy_size_t for parser alloc definitions, fixes build errors on 64bit
+    architectures
 
 1.8.2
   * - ignore invalid html attribute characters
diff --git a/linkcheck/parser/htmllex.c b/linkcheck/parser/htmllex.c
index 6b42a7ef..28e517b7 100644
--- a/linkcheck/parser/htmllex.c
+++ b/linkcheck/parser/htmllex.c
@@ -6677,10 +6677,10 @@ char *yytext;
 #define SET_ERROR(s)
 
 /* use Pythons memory management */
-void* yyalloc (size_t bytes, void* yyscanner) {
+void* yyalloc (yy_size_t bytes, void* yyscanner) {
     return PyMem_Malloc(bytes);
 }
-void* yyrealloc (void* ptr, size_t bytes, void* yyscanner) {
+void* yyrealloc (void* ptr, yy_size_t bytes, void* yyscanner) {
     return PyMem_Realloc(ptr, bytes);
 }
 void yyfree (void* ptr, void* yyscanner) {
diff --git a/linkcheck/parser/htmllex.l b/linkcheck/parser/htmllex.l
index 140cdb54..153f9df4 100644
--- a/linkcheck/parser/htmllex.l
+++ b/linkcheck/parser/htmllex.l
@@ -100,10 +100,10 @@
 #define SET_ERROR(s)
 
 /* use Pythons memory management */
-void* yyalloc (size_t bytes, void* yyscanner) {
+void* yyalloc (yy_size_t bytes, void* yyscanner) {
     return PyMem_Malloc(bytes);
 }
-void* yyrealloc (void* ptr, size_t bytes, void* yyscanner) {
+void* yyrealloc (void* ptr, yy_size_t bytes, void* yyscanner) {
     return PyMem_Realloc(ptr, bytes);
 }
 void yyfree (void* ptr, void* yyscanner) {