diff --git a/dlls/msi/install.c b/dlls/msi/install.c
index 7e9fdad3b9f..2ba539b339b 100644
--- a/dlls/msi/install.c
+++ b/dlls/msi/install.c
@@ -459,6 +459,24 @@ BOOL WINAPI MsiGetMode(MSIHANDLE hInstall, MSIRUNMODE iRunMode)
     return TRUE;
 }
 
+/***********************************************************************
+ *           MsiSetMode    (MSI.@)
+ */
+BOOL WINAPI MsiSetMode(MSIHANDLE hInstall, MSIRUNMODE iRunMode, BOOL fState)
+{
+    switch (iRunMode)
+    {
+    case MSIRUNMODE_RESERVED11:
+    case MSIRUNMODE_WINDOWS9X:
+    case MSIRUNMODE_RESERVED14:
+    case MSIRUNMODE_RESERVED15:
+        return FALSE;
+    default:
+        FIXME("%ld %d %d\n", hInstall, iRunMode, fState);
+    }
+    return TRUE;
+}
+
 /***********************************************************************
  * MsiSetFeatureStateA (MSI.@)
  *
diff --git a/dlls/msi/msi.spec b/dlls/msi/msi.spec
index 4a3cf39c3dc..b8dc4fb7cfa 100644
--- a/dlls/msi/msi.spec
+++ b/dlls/msi/msi.spec
@@ -136,7 +136,7 @@
 140 stub MsiSetInstallLevel
 141 stdcall MsiSetInternalUI(long ptr)
 142 stub MsiVerifyDiskSpace
-143 stub MsiSetMode
+143 stdcall MsiSetMode(long long long)
 144 stdcall MsiSetPropertyA(long str str)
 145 stdcall MsiSetPropertyW(long wstr wstr)
 146 stdcall MsiSetTargetPathA(long str str)
diff --git a/include/msiquery.h b/include/msiquery.h
index ab70681cb69..b5b2c4a78c2 100644
--- a/include/msiquery.h
+++ b/include/msiquery.h
@@ -261,6 +261,7 @@ UINT WINAPI MsiSummaryInfoGetPropertyCount(MSIHANDLE,UINT*);
 
 UINT WINAPI MsiEnableUIPreview(MSIHANDLE, MSIHANDLE*);
 BOOL WINAPI MsiGetMode(MSIHANDLE, MSIRUNMODE);
+BOOL WINAPI MsiSetMode(MSIHANDLE, MSIRUNMODE, BOOL);
 
 UINT WINAPI MsiViewModify(MSIHANDLE, MSIMODIFY, MSIHANDLE);