diff --git a/libretro-common/file/file_archive_zlib.c b/libretro-common/file/file_archive_zlib.c
index 1d259331a0..8faf97ebc4 100644
--- a/libretro-common/file/file_archive_zlib.c
+++ b/libretro-common/file/file_archive_zlib.c
@@ -139,7 +139,7 @@ static bool zlib_stream_decompress_data_to_file_init(
    if (!(handle->stream = (z_stream*)zlib_stream_new()))
       goto error;
    
-   if (inflateInit2(handle->stream, -MAX_WBITS) != Z_OK)
+   if (inflateInit2((z_streamp)handle->stream, -MAX_WBITS) != Z_OK)
       goto error;
 
    handle->data = (uint8_t*)malloc(size);
diff --git a/libretro-common/include/file/file_archive.h b/libretro-common/include/file/file_archive.h
index 32cdc48c97..1fde5d777f 100644
--- a/libretro-common/include/file/file_archive.h
+++ b/libretro-common/include/file/file_archive.h
@@ -148,7 +148,7 @@ void file_archive_deflate_init(void *data, int level);
 
 const struct file_archive_file_backend *file_archive_get_default_file_backend(void);
 
-const struct file_archive_file_backend zlib_backend;
+extern const struct file_archive_file_backend zlib_backend;
 
 #endif