diff --git a/strbuf_helpers.c b/strbuf_helpers.c
index ea2b995f..1c577c90 100644
--- a/strbuf_helpers.c
+++ b/strbuf_helpers.c
@@ -716,6 +716,12 @@ strbuf strbuf_json_boolean(strbuf sb, int boolean)
   return sb;
 }
 
+strbuf strbuf_json_integer(strbuf sb, int64_t integer)
+{
+  strbuf_sprintf(sb, "%"PRId64, integer);
+  return sb;
+}
+
 static const uint32_t offsetsFromUTF8[6] = {
   0x00000000UL, 0x00003080UL, 0x000E2080UL,
   0x03C82080UL, 0xFA082080UL, 0x82082080UL
@@ -820,8 +826,7 @@ strbuf strbuf_json_atom(strbuf sb, const struct json_atom *atom)
     case JSON_BOOLEAN:
       return strbuf_json_boolean(sb, atom->u.boolean);
     case JSON_INTEGER:
-      strbuf_sprintf(sb, "%"PRId64, atom->u.integer);
-      return sb;
+      return strbuf_json_integer(sb, atom->u.integer);
     case JSON_STRING_NULTERM:
       return strbuf_json_string(sb, atom->u.string.content);
     case JSON_STRING_LENGTH:
diff --git a/strbuf_helpers.h b/strbuf_helpers.h
index 3e00109a..648d45f3 100644
--- a/strbuf_helpers.h
+++ b/strbuf_helpers.h
@@ -234,6 +234,7 @@ strbuf strbuf_html_escape(strbuf sb, const char *, size_t);
  */
 strbuf strbuf_json_null(strbuf sb);
 strbuf strbuf_json_boolean(strbuf sb, int boolean);
+strbuf strbuf_json_integer(strbuf sb, int64_t integer);
 strbuf strbuf_json_string(strbuf sb, const char *str); // str can be NULL
 strbuf strbuf_json_string_len(strbuf sb, const char *str, size_t strlen); // str cannot be NULL
 strbuf strbuf_json_hex(strbuf sb, const unsigned char *buf, size_t len);