diff --git a/dlls/msi/automation.c b/dlls/msi/automation.c
index 834e40679a6..3b01266c975 100644
--- a/dlls/msi/automation.c
+++ b/dlls/msi/automation.c
@@ -708,7 +708,7 @@ static const struct IEnumVARIANTVtbl ListEnumerator_Vtbl =
 /* Helper function that copies a passed parameter instead of using VariantChangeType like the actual DispGetParam.
    This function is only for VARIANT type parameters that have several types that cannot be properly discriminated
    using DispGetParam/VariantChangeType. */
-static HRESULT WINAPI DispGetParam_CopyOnly(
+static HRESULT DispGetParam_CopyOnly(
         DISPPARAMS *pdispparams, /* [in] Parameter list */
         UINT        *position,    /* [in] Position of parameter to copy in pdispparams; on return will contain calculated position */
         VARIANT    *pvarResult)  /* [out] Destination for resulting variant */
diff --git a/dlls/msi/custom.c b/dlls/msi/custom.c
index 71864d519db..66a7ce6a89f 100644
--- a/dlls/msi/custom.c
+++ b/dlls/msi/custom.c
@@ -659,7 +659,7 @@ static UINT get_action_info( const GUID *guid, INT *type, MSIHANDLE *handle,
     return ERROR_SUCCESS;
 }
 
-static DWORD WINAPI ACTION_CallDllFunction( const GUID *guid )
+static DWORD ACTION_CallDllFunction( const GUID *guid )
 {
     MsiCustomActionEntryPoint fn;
     MSIHANDLE hPackage, handle;
@@ -744,7 +744,7 @@ static DWORD WINAPI DllThread( LPVOID arg )
     return rc;
 }
 
-static DWORD WINAPI ACTION_CAInstallPackage(const GUID *guid)
+static DWORD ACTION_CAInstallPackage(const GUID *guid)
 {
     msi_custom_action_info *info;
     UINT r = ERROR_FUNCTION_FAILED;
@@ -1147,7 +1147,7 @@ static UINT HANDLE_CustomType34(MSIPACKAGE *package, LPCWSTR source,
     return wait_process_handle(package, type, info.hProcess, action);
 }
 
-static DWORD WINAPI ACTION_CallScript( const GUID *guid )
+static DWORD ACTION_CallScript( const GUID *guid )
 {
     msi_custom_action_info *info;
     MSIHANDLE hPackage;
diff --git a/dlls/msi/install.c b/dlls/msi/install.c
index 95fe51a194f..bcb68c38865 100644
--- a/dlls/msi/install.c
+++ b/dlls/msi/install.c
@@ -215,8 +215,8 @@ UINT msi_strcpy_to_awstring( LPCWSTR str, awstring *awbuf, DWORD *sz )
 /***********************************************************************
  * MsiGetTargetPath   (internal)
  */
-static UINT WINAPI MSI_GetTargetPath( MSIHANDLE hInstall, LPCWSTR szFolder,
-                                      awstring *szPathBuf, LPDWORD pcchPathBuf )
+static UINT MSI_GetTargetPath( MSIHANDLE hInstall, LPCWSTR szFolder,
+                               awstring *szPathBuf, LPDWORD pcchPathBuf )
 {
     MSIPACKAGE *package;
     LPWSTR path;
diff --git a/dlls/msi/msi.c b/dlls/msi/msi.c
index 2b3b635390d..68c0706d9ba 100644
--- a/dlls/msi/msi.c
+++ b/dlls/msi/msi.c
@@ -690,8 +690,8 @@ static LPWSTR msi_reg_get_value(HKEY hkey, LPCWSTR name, DWORD *type)
     return strdupW(temp);
 }
 
-static UINT WINAPI MSI_GetProductInfo(LPCWSTR szProduct, LPCWSTR szAttribute,
-                                      awstring *szValue, LPDWORD pcchValueBuf)
+static UINT MSI_GetProductInfo(LPCWSTR szProduct, LPCWSTR szAttribute,
+                               awstring *szValue, LPDWORD pcchValueBuf)
 {
     UINT r = ERROR_UNKNOWN_PROPERTY;
     HKEY prodkey, userdata, source;
@@ -1748,8 +1748,8 @@ UINT WINAPI MsiVerifyPackageW( LPCWSTR szPackage )
     return r;
 }
 
-static INSTALLSTATE WINAPI MSI_GetComponentPath(LPCWSTR szProduct, LPCWSTR szComponent,
-                                                awstring* lpPathBuf, LPDWORD pcchBuf)
+static INSTALLSTATE MSI_GetComponentPath(LPCWSTR szProduct, LPCWSTR szComponent,
+                                         awstring* lpPathBuf, LPDWORD pcchBuf)
 {
     WCHAR squished_pc[GUID_SIZE];
     WCHAR squished_comp[GUID_SIZE];
@@ -2292,7 +2292,7 @@ INSTALLSTATE WINAPI MsiUseFeatureA( LPCSTR szProduct, LPCSTR szFeature )
 /***********************************************************************
  * MSI_ProvideQualifiedComponentEx [internal]
  */
-static UINT WINAPI MSI_ProvideQualifiedComponentEx(LPCWSTR szComponent,
+static UINT MSI_ProvideQualifiedComponentEx(LPCWSTR szComponent,
                 LPCWSTR szQualifier, DWORD dwInstallMode, LPCWSTR szProduct,
                 DWORD Unused1, DWORD Unused2, awstring *lpPathBuf,
                 LPDWORD pcchPathBuf)
@@ -2417,7 +2417,7 @@ UINT WINAPI MsiProvideQualifiedComponentA( LPCSTR szComponent,
 /***********************************************************************
  * MSI_GetUserInfo [internal]
  */
-static USERINFOSTATE WINAPI MSI_GetUserInfo(LPCWSTR szProduct,
+static USERINFOSTATE MSI_GetUserInfo(LPCWSTR szProduct,
                 awstring *lpUserNameBuf, LPDWORD pcchUserNameBuf,
                 awstring *lpOrgNameBuf, LPDWORD pcchOrgNameBuf,
                 awstring *lpSerialBuf, LPDWORD pcchSerialBuf)
diff --git a/dlls/msi/registry.c b/dlls/msi/registry.c
index 26b872daac8..2568e7e8679 100644
--- a/dlls/msi/registry.c
+++ b/dlls/msi/registry.c
@@ -1436,7 +1436,7 @@ UINT WINAPI MsiEnumClientsW(LPCWSTR szComponent, DWORD index, LPWSTR szProduct)
     return r;
 }
 
-static UINT WINAPI MSI_EnumComponentQualifiers( LPCWSTR szComponent, DWORD iIndex,
+static UINT MSI_EnumComponentQualifiers( LPCWSTR szComponent, DWORD iIndex,
                 awstring *lpQualBuf, LPDWORD pcchQual,
                 awstring *lpAppBuf, LPDWORD pcchAppBuf )
 {