diff --git a/test/eierpecken.c b/test/eierpecken.c
index 439e9b1..7fe3d9d 100644
--- a/test/eierpecken.c
+++ b/test/eierpecken.c
@@ -1358,6 +1358,15 @@ _peck_mark(struct peck *peck, const char *func, int line)
 	log_debug(peck, "mark %3d: line %d in %s()\n", mark++, line, func);
 }
 
+void _peck_debug(struct peck *peck, const char *func, int line, const char *format, ...)
+{
+	va_list args;
+
+	va_start(args, format);
+	log_msg_va(peck->logger, LOGGER_DEBUG, "unused", line, func, format, args);
+	va_end(args);
+}
+
 MUNIT_GLOBAL_SETUP(init_sigalarm)
 {
 	int argc = setup->argc;
diff --git a/test/eierpecken.h b/test/eierpecken.h
index 88e0d14..a692757 100644
--- a/test/eierpecken.h
+++ b/test/eierpecken.h
@@ -152,6 +152,9 @@ void _peck_mark(struct peck *peck, const char *func, int line);
 /** Add debug marker to the log output */
 #define peck_mark(peck_) _peck_mark(peck_, __func__, __LINE__)
 
+void _peck_debug(struct peck *peck, const char *func, int line, const char *format, ...);
+#define peck_debug(peck_, ...) _peck_debug(peck_, __func__, __LINE__, __VA_ARGS__)
+
 void
 peck_enable_eis_behavior(struct peck *peck, enum peck_eis_behavior behavior);