diff --git a/src/driver/toks_driver_ctx.c b/src/driver/toks_driver_ctx.c
index de6e05e..05c026b 100644
--- a/src/driver/toks_driver_ctx.c
+++ b/src/driver/toks_driver_ctx.c
@@ -324,6 +324,7 @@ int toks_get_driver_ctx(
 	ctrlpid   = 0;
 	csyspid   = 0;
 	keylen    = 0;
+	refstr    = 0;
 	ntokens   = 0;
 	loglevel  = 0;
 	timeout   = (-1);