diff --git a/dlls/msi/msi.c b/dlls/msi/msi.c
index 7432aee..9f3d9b3 100644
--- a/dlls/msi/msi.c
+++ b/dlls/msi/msi.c
@@ -3033,3 +3033,23 @@ UINT WINAPI MsiSetExternalUIRecord( INSTALLUI_HANDLER_RECORD puiHandler,
                              ppuiPrevHandler);
     return ERROR_CALL_NOT_IMPLEMENTED;
 }
+
+/***********************************************************************
+ * MsiDetermineApplicablePatchesA     [MSI.@]
+ */
+UINT WINAPI MsiDetermineApplicablePatchesA(LPCSTR szProductPackagePath,
+                                           DWORD cPatchInfo, PMSIPATCHSEQUENCEINFOA pPatchInfo)
+{
+    FIXME("%s %d %p\n", debugstr_a(szProductPackagePath), cPatchInfo, pPatchInfo);
+    return ERROR_CALL_NOT_IMPLEMENTED;
+}
+
+/***********************************************************************
+ * MsiDetermineApplicablePatchesW     [MSI.@]
+ */
+UINT WINAPI MsiDetermineApplicablePatchesW(LPCWSTR szProductPackagePath,
+                                           DWORD cPatchInfo, PMSIPATCHSEQUENCEINFOW pPatchInfo)
+{
+    FIXME("%s %d %p\n", debugstr_w(szProductPackagePath), cPatchInfo, pPatchInfo);
+    return ERROR_CALL_NOT_IMPLEMENTED;
+}
diff --git a/dlls/msi/msi.spec b/dlls/msi/msi.spec
index 4ab0bb1..c2a0cd0 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 c4f5e0d..4917782 100644
--- a/include/msi.h
+++ b/include/msi.h
@@ -196,11 +196,37 @@ typedef enum tagMSICODE
     MSICODE_PATCH = 0x40000000L
 } MSICODE;
 
+typedef enum tagMSIPATCHDATATYPE
+{
+    MSIPATCH_DATATYPE_PATCHFILE = 0,
+    MSIPATCH_DATATYPE_XMLPATH = 1,
+    MSIPATCH_DATATYPE_XMLBLOB =2,
+} MSIPATCHDATATYPE, *PMSIPATCHDATATYPE;
+
 typedef struct _MSIFILEHASHINFO {
     ULONG dwFileHashInfoSize;
     ULONG dwData[4];
 } MSIFILEHASHINFO, *PMSIFILEHASHINFO;
 
+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;
+
+DECL_WINELIB_TYPE_AW(MSIPATCHSEQUENCEINFO)
+DECL_WINELIB_TYPE_AW(PMSIPATCHSEQUENCEINFO)
+
 #define MAX_FEATURE_CHARS 38
 
 /* Strings defined in msi.h */
@@ -599,6 +625,10 @@ UINT WINAPI MsiIsProductElevatedA(LPCSTR, BOOL *);
 UINT WINAPI MsiIsProductElevatedW(LPCWSTR, BOOL *);
 #define     MsiIsProductElevated WINELIB_NAME_AW(MsiIsProductElevated)
 
+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);