diff --git a/patches/dxdiag-new-dlls/0016-dpmodemx-Add-stub-SPInit.patch b/patches/dxdiag-new-dlls/0016-dpmodemx-Add-stub-SPInit.patch
new file mode 100644
index 00000000..dd03083b
--- /dev/null
+++ b/patches/dxdiag-new-dlls/0016-dpmodemx-Add-stub-SPInit.patch
@@ -0,0 +1,45 @@
+From a615211907b65642807cdad546a0eaf12e39f43c Mon Sep 17 00:00:00 2001
+From: Alistair Leslie-Hughes <leslie_alistair@hotmail.com>
+Date: Sun, 27 Dec 2020 09:57:46 +1100
+Subject: [PATCH] dpmodemx: Add stub SPInit
+
+---
+ dlls/dpmodemx/dpmodemx.spec   | 2 +-
+ dlls/dpmodemx/dpmodemx_main.c | 8 ++++++++
+ 2 files changed, 9 insertions(+), 1 deletion(-)
+
+diff --git a/dlls/dpmodemx/dpmodemx.spec b/dlls/dpmodemx/dpmodemx.spec
+index 14fb05053a8..e3beb3f8cc7 100644
+--- a/dlls/dpmodemx/dpmodemx.spec
++++ b/dlls/dpmodemx/dpmodemx.spec
+@@ -1 +1 @@
+-@ stub SPInit
+\ No newline at end of file
++@ stdcall SPInit(ptr)
+\ No newline at end of file
+diff --git a/dlls/dpmodemx/dpmodemx_main.c b/dlls/dpmodemx/dpmodemx_main.c
+index f5d7a8340ca..5d322783b40 100644
+--- a/dlls/dpmodemx/dpmodemx_main.c
++++ b/dlls/dpmodemx/dpmodemx_main.c
+@@ -23,6 +23,8 @@
+ #include "winbase.h"
+ #include "wine/debug.h"
+ 
++#include "wine/dplaysp.h"
++
+ WINE_DEFAULT_DEBUG_CHANNEL(dpmodemx);
+ 
+ BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, void *reserved)
+@@ -40,3 +42,9 @@ BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, void *reserved)
+ 
+     return TRUE;
+ }
++
++HRESULT WINAPI SPInit( LPSPINITDATA lpspData )
++{
++    FIXME("Currently not implemented.\n");
++    return DPERR_UNAVAILABLE;
++}
+-- 
+2.29.2
+
diff --git a/patches/patchinstall.sh b/patches/patchinstall.sh
index 5551ae4d..b078c8a2 100755
--- a/patches/patchinstall.sh
+++ b/patches/patchinstall.sh
@@ -2441,6 +2441,7 @@ if test "$enable_dxdiag_new_dlls" -eq 1; then
 	patch_apply dxdiag-new-dlls/0013-gcdef-add-stub-dll.patch
 	patch_apply dxdiag-new-dlls/0014-qdv-add-stub-dll.patch
 	patch_apply dxdiag-new-dlls/0015-qedwipes-add-stub-dll.patch
+	patch_apply dxdiag-new-dlls/0016-dpmodemx-Add-stub-SPInit.patch
 fi
 
 # Patchset ntdll-DOS_Attributes