diff --git a/src/ptrace/_UPT_elf.c b/src/ptrace/_UPT_elf.c
index e69de29b..cf0480f2 100644
--- a/src/ptrace/_UPT_elf.c
+++ b/src/ptrace/_UPT_elf.c
@@ -0,0 +1,5 @@
+/* We need to get a separate copy of the ELF-code into
+   libunwind-ptrace since it cannot (and must not) have any ELF
+   dependencies on libunwind.  */
+#include "libunwind_i.h"	/* get ELFCLASS defined */
+#include "../elfxx.c"