diff --git a/src/obierrno.h b/src/obierrno.h
index 53f8e3a..d7cfe3a 100644
--- a/src/obierrno.h
+++ b/src/obierrno.h
@@ -126,6 +126,8 @@ extern int obi_errno;
  	 	 	 	 	 	 	 	 	 	 	 */
 #define OBI_ECOPCR_ERROR    		(33)    /** Error while performing an in silico PCR
  	 	 	 	 	 	 	 	 	 	 	 */
+#define OBI_JSON_ERROR       		(34)    /** Error related to JSON operations.
+ 	 	 	 	 	 	 	 	 	 	 	 */
 /**@}*/
 
 #endif /* OBIERRNO_H_ */