diff --git a/Source/Core/Core/IOS/WFS/WFSSRV.cpp b/Source/Core/Core/IOS/WFS/WFSSRV.cpp
index 6ff55a8e66..a2601f3422 100644
--- a/Source/Core/Core/IOS/WFS/WFSSRV.cpp
+++ b/Source/Core/Core/IOS/WFS/WFSSRV.cpp
@@ -4,6 +4,7 @@
 
 #include "Core/IOS/WFS/WFSSRV.h"
 
+#include <cinttypes>
 #include <string>
 #include <vector>
 
@@ -157,6 +158,28 @@ IPCCommandResult WFSSRV::IOCtl(const IOCtlRequest& request)
     break;
   }
 
+  case IOCTL_WFS_GET_SIZE:
+  {
+    u16 fd = Memory::Read_U16(request.buffer_in);
+    FileDescriptor* fd_obj = FindFileDescriptor(fd);
+    if (fd_obj == nullptr)
+    {
+      ERROR_LOG(IOS, "IOCTL_WFS_GET_SIZE: invalid file descriptor %d", fd);
+      return_error_code = WFS_EBADFD;
+      break;
+    }
+
+    u64 size = fd_obj->file.GetSize();
+    u32 truncated_size = static_cast<u32>(size);
+    INFO_LOG(IOS, "IOCTL_WFS_GET_SIZE(%d) -> %d", fd, truncated_size);
+    if (size != truncated_size)
+    {
+      ERROR_LOG(IOS, "IOCTL_WFS_GET_SIZE: file %d too large (%" PRIu64 ")", fd, size);
+    }
+    Memory::Write_U32(truncated_size, request.buffer_out);
+    break;
+  }
+
   case IOCTL_WFS_CLOSE:
   {
     u16 fd = Memory::Read_U16(request.buffer_in + 0x4);
diff --git a/Source/Core/Core/IOS/WFS/WFSSRV.h b/Source/Core/Core/IOS/WFS/WFSSRV.h
index 889bfc25fd..72b051f87a 100644
--- a/Source/Core/Core/IOS/WFS/WFSSRV.h
+++ b/Source/Core/Core/IOS/WFS/WFSSRV.h
@@ -61,6 +61,7 @@ private:
     IOCTL_WFS_DELETE = 0x15,
     IOCTL_WFS_GET_ATTRIBUTES = 0x17,
     IOCTL_WFS_OPEN = 0x1A,
+    IOCTL_WFS_GET_SIZE = 0x1B,
     IOCTL_WFS_CLOSE = 0x1E,
     IOCTL_WFS_READ = 0x20,
     IOCTL_WFS_WRITE = 0x22,
@@ -70,6 +71,7 @@ private:
 
   enum
   {
+    WFS_EBADFD = -10026,  // Invalid file descriptor.
     WFS_EEMPTY = -10028,  // Directory is empty of iteration completed.
   };