diff --git a/project.gyp b/project.gyp
index 0006a18a..feeb1fac 100644
--- a/project.gyp
+++ b/project.gyp
@@ -94,7 +94,6 @@
         'src/runtime/node.c',
         'src/runtime/stack.c',
         'src/runtime/parser.c',
-        'src/runtime/string_input.c',
         'src/runtime/subtree.c',
         'src/runtime/tree.c',
         'src/runtime/tree_cursor.c',
diff --git a/src/runtime/parser.c b/src/runtime/parser.c
index 58302445..7e0e6184 100644
--- a/src/runtime/parser.c
+++ b/src/runtime/parser.c
@@ -13,7 +13,6 @@
 #include "runtime/reusable_node.h"
 #include "runtime/reduce_action.h"
 #include "runtime/error_costs.h"
-#include "runtime/string_input.h"
 #include "runtime/tree.h"
 
 #define LOG(...)                                                                            \
@@ -80,6 +79,24 @@ typedef enum {
   ErrorComparisonTakeRight,
 } ErrorComparison;
 
+typedef struct {
+  const char *string;
+  uint32_t length;
+} TSStringInput;
+
+// StringInput
+
+static const char *ts_string_input_read(void *_self, uint32_t byte, TSPoint _, uint32_t *length) {
+  TSStringInput *self = (TSStringInput *)_self;
+  if (byte >= self->length) {
+    *length = 0;
+    return "";
+  } else {
+    *length = self->length - byte;
+    return self->string + byte;
+  }
+}
+
 // Parser - Private
 
 static void ts_parser__log(TSParser *self) {
@@ -1474,7 +1491,10 @@ TSTree *ts_parser_parse(TSParser *self, const TSTree *old_tree, TSInput input) {
 
 TSTree *ts_parser_parse_string(TSParser *self, const TSTree *old_tree,
                                const char *string, uint32_t length) {
-  TSStringInput input;
-  ts_string_input_init(&input, string, length);
-  return ts_parser_parse(self, old_tree, ts_string_input_get(&input));
+  TSStringInput input = {string, length};
+  return ts_parser_parse(self, old_tree, (TSInput) {
+    &input,
+    ts_string_input_read,
+    TSInputEncodingUTF8,
+  });
 }
diff --git a/src/runtime/string_input.c b/src/runtime/string_input.c
deleted file mode 100644
index 3ddc0c0d..00000000
--- a/src/runtime/string_input.c
+++ /dev/null
@@ -1,28 +0,0 @@
-#include "tree_sitter/runtime.h"
-#include "runtime/string_input.h"
-#include <string.h>
-
-static const char *ts_string_input__read(void *payload, uint32_t byte_offset,
-                                         TSPoint _, uint32_t *bytes_read) {
-  TSStringInput *input = (TSStringInput *)payload;
-  if (byte_offset >= input->length) {
-    *bytes_read = 0;
-    return "";
-  } else {
-    *bytes_read = input->length - byte_offset;
-    return input->string + byte_offset;
-  }
-}
-
-void ts_string_input_init(TSStringInput *self, const char *string, uint32_t length) {
-  self->string = string;
-  self->length = length;
-}
-
-TSInput ts_string_input_get(TSStringInput *self) {
-  return (TSInput) {
-    .payload = self,
-    .read = ts_string_input__read,
-    .encoding = TSInputEncodingUTF8,
-  };
-}
diff --git a/src/runtime/string_input.h b/src/runtime/string_input.h
deleted file mode 100644
index b2e7536f..00000000
--- a/src/runtime/string_input.h
+++ /dev/null
@@ -1,22 +0,0 @@
-#ifndef RUNTIME_STRING_INPUT_H_
-#define RUNTIME_STRING_INPUT_H_
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#include "tree_sitter/runtime.h"
-
-typedef struct {
-  const char *string;
-  uint32_t length;
-} TSStringInput;
-
-void ts_string_input_init(TSStringInput *, const char *, uint32_t);
-TSInput ts_string_input_get(TSStringInput *);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif  // RUNTIME_STRING_INPUT_H_