diff --git a/strerror_override_private.h b/strerror_override_private.h
new file mode 100644
index 0000000000..c7db84ced0
--- /dev/null
+++ b/strerror_override_private.h
@@ -0,0 +1,7 @@
+#ifndef __json_strerror_override_private_h__
+#define __json_strerror_override_private_h__
+
+/* Used by tests to get consistent output */
+extern int _json_c_strerror_enable;
+
+#endif