diff --git a/reactos/base/system/services/config.c b/reactos/base/system/services/config.c
index 0bdd98f23b9..4a529c171d6 100644
--- a/reactos/base/system/services/config.c
+++ b/reactos/base/system/services/config.c
@@ -129,6 +129,7 @@ ScmWriteDependencies(HKEY hServiceKey,
             if (*lpSrc == SC_GROUP_IDENTIFIERW)
             {
                 lpSrc++;
+                cchLength--;
                 cchGroupLength += cchLength;
                 wcscpy(lpDst, lpSrc);
                 lpDst = lpDst + cchLength;