diff --git a/libfio.c b/libfio.c
index ac629dc..433fee4 100644
--- a/libfio.c
+++ b/libfio.c
@@ -119,6 +119,7 @@
 		td->io_issues[i] = 0;
 		td->ts.total_io_u[i] = 0;
 		td->ts.runtime[i] = 0;
+		td->rwmix_issues = 0;
 	}
 
 	fio_gettime(&tv, NULL);