diff --git a/src/capture.c b/src/capture.c
index 8849eca..dde4e86 100644
--- a/src/capture.c
+++ b/src/capture.c
@@ -142,7 +142,7 @@ int hexagram_capture_save(hexagram_capture *capture,
                           hexagram_can_if *can_if) {
     struct can_frame frame;
 
-    while (hexagram_can_if_read(can_if, &frame) >= 0) {
+    while (hexagram_can_if_read(can_if, &frame) > 0) {
         struct timeval timestamp;
 
         if (ioctl(can_if->sock, SIOCGSTAMP, &timestamp) < 0) {