diff --git a/src/include/taler_util.h b/src/include/taler_util.h
index 07b78a432..22d7f7f2a 100644
--- a/src/include/taler_util.h
+++ b/src/include/taler_util.h
@@ -335,4 +335,15 @@ TALER_arg_to_yna (struct MHD_Connection *connection,
                   enum TALER_EXCHANGE_YesNoAll default_val,
                   enum TALER_EXCHANGE_YesNoAll *yna);
 
+
+/**
+ * Convert YNA value to a string.
+ *
+ * @param yna value to convert
+ * @return string representation ("yes"/"no"/"all").
+ */
+const char *
+TALER_yna_to_string (enum TALER_EXCHANGE_YesNoAll yna);
+
+
 #endif
diff --git a/src/util/yna.c b/src/util/yna.c
index 6907df675..fa7cf9348 100644
--- a/src/util/yna.c
+++ b/src/util/yna.c
@@ -64,3 +64,25 @@ TALER_arg_to_yna (struct MHD_Connection *connection,
   }
   return false;
 }
+
+
+/**
+ * Convert YNA value to a string.
+ *
+ * @param yna value to convert
+ * @return string representation ("yes"/"no"/"all").
+ */
+const char *
+TALER_yna_to_string (enum TALER_EXCHANGE_YesNoAll yna)
+{
+  switch (yna)
+  {
+  case TALER_EXCHANGE_YNA_YES:
+    return "yes";
+  case TALER_EXCHANGE_YNA_NO:
+    return "no";
+  case TALER_EXCHANGE_YNA_ALL:
+    return "all";
+  }
+  GNUNET_assert (0);
+}