diff --git a/dlls/msi/msi.c b/dlls/msi/msi.c
index a35f460e1a8..c23341155ba 100644
--- a/dlls/msi/msi.c
+++ b/dlls/msi/msi.c
@@ -372,6 +372,24 @@ done:
     return r;
 }
 
+UINT WINAPI MsiDetermineApplicablePatchesA(LPCSTR szProductPackagePath,
+        DWORD cPatchInfo, PMSIPATCHSEQUENCEINFOA pPatchInfo)
+{
+    FIXME("(%s, %d, %p): stub!\n", debugstr_a(szProductPackagePath),
+          cPatchInfo, pPatchInfo);
+
+    return ERROR_CALL_NOT_IMPLEMENTED;
+}
+
+UINT WINAPI MsiDetermineApplicablePatchesW(LPCWSTR szProductPackagePath,
+        DWORD cPatchInfo, PMSIPATCHSEQUENCEINFOW pPatchInfo)
+{
+    FIXME("(%s, %d, %p): stub!\n", debugstr_w(szProductPackagePath),
+          cPatchInfo, pPatchInfo);
+
+    return ERROR_CALL_NOT_IMPLEMENTED;
+}
+
 static UINT msi_open_package(LPCWSTR product, MSIINSTALLCONTEXT context,
                              MSIPACKAGE **package)
 {
diff --git a/dlls/msi/msi.spec b/dlls/msi/msi.spec
index 925cfde5e5f..db7aa902e1c 100644
--- a/dlls/msi/msi.spec
+++ b/dlls/msi/msi.spec
@@ -270,8 +270,8 @@
 274 stdcall MsiSourceListAddMediaDiskW(wstr wstr long long long wstr wstr)
 275 stub MsiSourceListClearMediaDiskA
 276 stub MsiSourceListClearMediaDiskW
-277 stub MsiDetermineApplicablePatchesA
-278 stub MsiDetermineApplicablePatchesW
+277 stdcall MsiDetermineApplicablePatchesA(str long ptr)
+278 stdcall MsiDetermineApplicablePatchesW(wstr long ptr)
 279 stub MsiMessageBoxExA
 280 stub MsiMessageBoxExW
 281 stdcall MsiSetExternalUIRecord(ptr long ptr ptr)
diff --git a/include/msi.h b/include/msi.h
index cf125efbab6..0def6cb5acc 100644
--- a/include/msi.h
+++ b/include/msi.h
@@ -201,6 +201,29 @@ typedef struct _MSIFILEHASHINFO {
     ULONG dwData[4];
 } MSIFILEHASHINFO, *PMSIFILEHASHINFO;
 
+typedef enum tagMSIPATCHDATATYPE
+{
+    MSIPATCH_DATATYPE_PATCHFILE = 0,
+    MSIPATCH_DATATYPE_XMLPATH = 1,
+    MSIPATCH_DATATYPE_XMLBLOB = 2,
+} MSIPATCHDATATYPE, *PMSIPATCHDATATYPE;
+
+typedef struct tagMSIPATCHSEQUENCEINFOA
+{
+    LPCSTR szPatchData;
+    MSIPATCHDATATYPE ePatchDataType;
+    DWORD dwOrder;
+    UINT uStatus;
+} MSIPATCHSEQUENCEINFOA, *PMSIPATCHSEQUENCEINFOA;
+
+typedef struct tagMSIPATCHSEQUENCEINFOW
+{
+    LPCWSTR szPatchData;
+    MSIPATCHDATATYPE ePatchDataType;
+    DWORD dwOrder;
+    UINT uStatus;
+} MSIPATCHSEQUENCEINFOW, *PMSIPATCHSEQUENCEINFOW;
+
 #define MAX_FEATURE_CHARS 38
 
 /* Strings defined in msi.h */
@@ -607,6 +630,10 @@ UINT WINAPI MsiInstallMissingComponentA(LPCSTR, LPCSTR, INSTALLSTATE);
 UINT WINAPI MsiInstallMissingComponentW(LPCWSTR, LPCWSTR, INSTALLSTATE);
 #define     MsiInstallMissingComponent WINELIB_NAME_AW(MsiInstallMissingComponent)
 
+UINT WINAPI MsiDetermineApplicablePatchesA(LPCSTR, DWORD, PMSIPATCHSEQUENCEINFOA);
+UINT WINAPI MsiDetermineApplicablePatchesW(LPCWSTR, DWORD, PMSIPATCHSEQUENCEINFOW);
+#define     MsiDetermineApplicablePatches WINELIB_NAME_AW(MsiDetermineApplicablePatches)
+
 /* Non Unicode */
 UINT WINAPI MsiCloseHandle(MSIHANDLE);
 UINT WINAPI MsiCloseAllHandles(void);