diff --git a/src/output-json-tls.c b/src/output-json-tls.c
index fb4685f606..2bd08c8c08 100644
--- a/src/output-json-tls.c
+++ b/src/output-json-tls.c
@@ -51,7 +51,7 @@
 #include "output-json.h"
 #include "output-json-tls.h"
 
-SC_ATOMIC_DECLARE(unsigned int, cert_id);
+SC_ATOMIC_EXTERN(unsigned int, cert_id);
 
 #define MODULE_NAME "LogTlsLog"
 #define DEFAULT_LOG_FILENAME "tls.json"