diff --git a/libctru/include/ctr/FS.h b/libctru/include/ctr/FS.h
index cc9f65b..7073fef 100644
--- a/libctru/include/ctr/FS.h
+++ b/libctru/include/ctr/FS.h
@@ -47,6 +47,7 @@ Result FSFILE_Close(Handle handle);
 Result FSFILE_Read(Handle handle, u32 *bytesRead, u64 offset, u32 *buffer, u32 size);
 Result FSFILE_Write(Handle handle, u32 *bytesWritten, u64 offset, u32 *buffer, u32 size, u32 flushFlags);
 Result FSFILE_GetSize(Handle handle, u64 *size);
+Result FSFILE_SetSize(Handle handle, u64 size);
 
 Result FSDIR_Read(Handle handle, u32 *entriesRead, u32 entrycount, u16 *buffer);
 Result FSDIR_Close(Handle handle);