1 files changed, 1 insertions, 1 deletions

diff --git a/apps/plugins/puzzles/src/maxflow.c b/apps/plugins/puzzles/src/maxflow.c
index 028946b9bd..97ae8c487d 100644
--- a/apps/plugins/puzzles/src/maxflow.c
+++ b/apps/plugins/puzzles/src/maxflow.c
@@ -80,7 +80,7 @@ int maxflow_with_scratch(void *scratch, int nv, int source, int sink,
         /*
          * Now do the BFS loop.
          */
-        while (head < tail && prev[sink] <= 0) {
+        while (head < tail && prev[sink] < 0) {
             from = todo[head++];
 
             /*