diff --git a/include/tree_sitter/runtime.h b/include/tree_sitter/runtime.h
index 66881d12..f0442477 100644
--- a/include/tree_sitter/runtime.h
+++ b/include/tree_sitter/runtime.h
@@ -87,7 +87,7 @@ void ts_parser_print_dot_graphs(TSParser *, FILE *);
 void ts_parser_halt_on_error(TSParser *, bool);
 TSTree *ts_parser_parse(TSParser *, const TSTree *, TSInput);
 TSTree *ts_parser_parse_string(TSParser *, const TSTree *, const char *, uint32_t);
-TSTree *ts_parser_parse_string_encoding(TSParser *, const TSTree *, const void *, uint32_t, TSInputEncoding);
+TSTree *ts_parser_parse_string_encoding(TSParser *, const TSTree *, const char *, uint32_t, TSInputEncoding);
 bool ts_parser_enabled(const TSParser *);
 void ts_parser_set_enabled(TSParser *, bool);
 size_t ts_parser_operation_limit(const TSParser *);
diff --git a/src/runtime/parser.c b/src/runtime/parser.c
index 1fb08a00..5a6c4dca 100644
--- a/src/runtime/parser.c
+++ b/src/runtime/parser.c
@@ -87,7 +87,7 @@ typedef enum {
 } ErrorComparison;
 
 typedef struct {
-  const void *string;
+  const char *string;
   uint32_t length;
 } TSStringInput;
 
@@ -1647,7 +1647,7 @@ TSTree *ts_parser_parse_string(TSParser *self, const TSTree *old_tree,
 }
 
 TSTree *ts_parser_parse_string_encoding(TSParser *self, const TSTree *old_tree,
-                                        const void *string, uint32_t length, TSInputEncoding encoding) {
+                                        const char *string, uint32_t length, TSInputEncoding encoding) {
   TSStringInput input = {string, length};
   return ts_parser_parse(self, old_tree, (TSInput) {
     &input,