diff --git a/reactos/base/system/services/rpcserver.c b/reactos/base/system/services/rpcserver.c
index 716741d7f24..1b97689ae31 100644
--- a/reactos/base/system/services/rpcserver.c
+++ b/reactos/base/system/services/rpcserver.c
@@ -1279,7 +1279,7 @@ ScmCanonDriverImagePath(DWORD dwStartType,
 
     /* Check if it has %SystemRoot% (len=13) */
     if (ServiceNameLen > 13 &&
-        !wcsnicmp(L"%SystemRoot%\\", lpServiceName, 13))
+        !wcsnicmp(L"%%SystemRoot%%\\", lpServiceName, 13))
     {
         /* Substitute %SystemRoot% with \\SystemRoot\\ */
         *lpCanonName = LocalAlloc(LMEM_ZEROINIT, ServiceNameLen * sizeof(WCHAR) + sizeof(WCHAR));