diff --git a/dlls/msi/appsearch.c b/dlls/msi/appsearch.c
index 4b65f6537ae..4c5847eec3d 100644
--- a/dlls/msi/appsearch.c
+++ b/dlls/msi/appsearch.c
@@ -493,7 +493,7 @@ static UINT ACTION_FileVersionMatches(MSISIGNATURE *sig, LPCWSTR filePath,
 
             if (buf)
             {
-                static WCHAR rootW[] = { '\\',0 };
+                static const WCHAR rootW[] = { '\\',0 };
                 UINT versionLen;
                 LPVOID subBlock = NULL;
 
diff --git a/dlls/msi/msi.c b/dlls/msi/msi.c
index 34cbe521b2c..2cb4848dbb7 100644
--- a/dlls/msi/msi.c
+++ b/dlls/msi/msi.c
@@ -1231,7 +1231,7 @@ end:
 UINT WINAPI MsiGetFileVersionW(LPCWSTR szFilePath, LPWSTR lpVersionBuf,
                 DWORD* pcchVersionBuf, LPWSTR lpLangBuf, DWORD* pcchLangBuf)
 {
-    static WCHAR szVersionResource[] = {'\\',0};
+    static const WCHAR szVersionResource[] = {'\\',0};
     static const WCHAR szVersionFormat[] = {
         '%','d','.','%','d','.','%','d','.','%','d',0};
     static const WCHAR szLangFormat[] = {'%','d',0};