diff --git a/reactos/base/system/msiexec/msiexec.c b/reactos/base/system/msiexec/msiexec.c
index 6577c789a6a..9f20b5b1634 100644
--- a/reactos/base/system/msiexec/msiexec.c
+++ b/reactos/base/system/msiexec/msiexec.c
@@ -344,14 +344,14 @@ static DWORD DoRegServer(void)
     CHAR path[MAX_PATH+12];
     DWORD ret = 0;
 
-    scm = OpenSCManager(NULL, SERVICES_ACTIVE_DATABASE, SC_MANAGER_CREATE_SERVICE);
+    scm = OpenSCManagerA(NULL, SERVICES_ACTIVE_DATABASEA, SC_MANAGER_CREATE_SERVICE);
     if (!scm)
     {
         fprintf(stderr, "Failed to open the service control manager.\n");
         return 1;
     }
 
-    GetSystemDirectory(path, MAX_PATH);
+    GetSystemDirectoryA(path, MAX_PATH);
     lstrcatA(path, "\\msiexec.exe /V");
 
     service = CreateServiceA(scm, "MSIServer", "MSIServer", GENERIC_ALL,
diff --git a/reactos/base/system/msiexec/service.c b/reactos/base/system/msiexec/service.c
index 64618b852f4..da552a712e6 100644
--- a/reactos/base/system/msiexec/service.c
+++ b/reactos/base/system/msiexec/service.c
@@ -132,7 +132,7 @@ static void WINAPI ServiceMain(DWORD argc, LPSTR *argv)
 
     UpdateSCMStatus(SERVICE_START_PENDING, NO_ERROR, 0);
 
-    kill_event = CreateEvent(0, TRUE, FALSE, 0);
+    kill_event = CreateEventW(0, TRUE, FALSE, 0);
     if (!kill_event)
     {
         fprintf(stderr, "Failed to create event\n");
@@ -156,7 +156,7 @@ DWORD DoService(void)
 {
     char service_name[] = "MSIServer";
 
-    const SERVICE_TABLE_ENTRY service[] =
+    const SERVICE_TABLE_ENTRYA service[] =
     {
         {service_name, ServiceMain},
         {NULL, NULL},
@@ -164,7 +164,7 @@ DWORD DoService(void)
 
     WINE_TRACE("Starting MSIServer service\n");
 
-    if (!StartServiceCtrlDispatcher(service))
+    if (!StartServiceCtrlDispatcherA(service))
     {
         fprintf(stderr, "Failed to start MSIServer service\n");
         return 1;