diff --git a/examples/C/virtual_file_system/vfs.h b/examples/C/virtual_file_system/vfs.h
index 3c50273f..d4cec2cc 100644
--- a/examples/C/virtual_file_system/vfs.h
+++ b/examples/C/virtual_file_system/vfs.h
@@ -44,7 +44,7 @@ bool virtual_file_system(const char* path, const unsigned char** file, int* leng
     return false;
 }
 
-void* vfs(const char* path, int* length) {
+const void* vfs(const char* path, int* length) {
     const unsigned char* file_data;
     int file_length;
 
diff --git a/examples/C/virtual_file_system/vfs.py b/examples/C/virtual_file_system/vfs.py
index 043379ad..234bbd1f 100644
--- a/examples/C/virtual_file_system/vfs.py
+++ b/examples/C/virtual_file_system/vfs.py
@@ -63,7 +63,7 @@ def generate_vfs_header(directory, output_header):
         header.write('    return false;\n')
         header.write('}\n\n')
 
-        header.write('void* vfs(const char* path, int* length) {\n')
+        header.write('const void* vfs(const char* path, int* length) {\n')
         header.write('    const unsigned char* file_data;\n')
         header.write('    int file_length;\n\n')