diff --git a/hurd/Makefile b/hurd/Makefile
index 7c34e9ad0df..7ad8aaca503 100644
--- a/hurd/Makefile
+++ b/hurd/Makefile
@@ -92,6 +92,7 @@ CFLAGS-RPC_exec_startup_get_info.o = $(no-stack-protector)
 
 # Make it simpler to unwind over INTR_MSG_TRAP
 CFLAGS-intr-msg.o = -fno-omit-frame-pointer
+CFLAGS-intr-msg.os = -fno-omit-frame-pointer
 
 # Make generated headers compatible with all support standards
 migheaderpipe := | sed -e 's/\<ino64_t\>/__ino64_t/' -e 's/\<loff_t\>/__loff_t/'