Index: COFF/Writer.cpp
===================================================================
--- COFF/Writer.cpp
+++ COFF/Writer.cpp
@@ -205,7 +205,8 @@
   *Hdr = Header;
   if (StringTableOff) {
     // If name is too long, write offset into the string table as a name.
-    sprintf(Hdr->Name, "/%d", StringTableOff);
+    snprintf(Hdr->Name, static_cast<size_t>(COFF::NameSize), "/%lu",
+             static_cast<unsigned long>(StringTableOff));
   } else {
     assert(!Config->Debug || Name.size() <= COFF::NameSize);
     strncpy(Hdr->Name, Name.data(),