diff --git a/src/confd/src/helpers.h b/src/confd/src/helpers.h
index ac91c193..8baba496 100644
--- a/src/confd/src/helpers.h
+++ b/src/confd/src/helpers.h
@@ -3,9 +3,12 @@
 #ifndef CONFD_HELPERS_H_
 #define CONFD_HELPERS_H_
 
-FILE *popenf(const char *type, const char *cmdf, ...);
+FILE *popenf(const char *type, const char *cmdf, ...)
+	__attribute__ ((format (printf, 2, 3)));
 
-int writedf(int value, const char *fmt, ...);
-int writesf(const char *str, const char *fmt, ...);
+int writedf(int value, const char *fmt, ...)
+	__attribute__ ((format (printf, 2, 3)));
+int writesf(const char *str, const char *fmt, ...)
+	__attribute__ ((format (printf, 2, 3)));
 
 #endif /* CONFD_HELPERS_H_ */
diff --git a/src/confd/src/srx_val.h b/src/confd/src/srx_val.h
index b6897b09..3ff8eacc 100644
--- a/src/confd/src/srx_val.h
+++ b/src/confd/src/srx_val.h
@@ -11,9 +11,14 @@
 int srx_set_item(sr_session_ctx_t *session, const sr_val_t *val, sr_edit_options_t opts,
 		 const char *fmt, ...) __attribute__ ((format (printf, 4, 5)));
 
-char *srx_get_str  (sr_session_ctx_t *session, const char *fmt, ...);
-int   srx_get_int  (sr_session_ctx_t *session, int *result, sr_val_type_t type, const char *fmt, ...);
-int   srx_get_bool (sr_session_ctx_t *session, const char *fmt, ...);
-int   srx_enabled  (sr_session_ctx_t *session, const char *fmt, ...);
+char *srx_get_str  (sr_session_ctx_t *session, const char *fmt, ...)
+	__attribute__ ((format (printf, 2, 3)));
+
+int   srx_get_int  (sr_session_ctx_t *session, int *result, sr_val_type_t type, const char *fmt, ...)
+	__attribute__ ((format (printf, 4, 5)));
+int   srx_get_bool (sr_session_ctx_t *session, const char *fmt, ...)
+	__attribute__ ((format (printf, 2, 3)));
+int   srx_enabled  (sr_session_ctx_t *session, const char *fmt, ...)
+	__attribute__ ((format (printf, 2, 3)));
 
 #endif /* CONFD_SRX_VAL_H_ */