diff --git a/src/graph.c b/src/graph.c
index 1c264d997..8accd808c 100644
--- a/src/graph.c
+++ b/src/graph.c
@@ -124,9 +124,9 @@ static int ahead_behind(git_commit_list_node *one, git_commit_list_node *two,
 			(commit->flags & (PARENT1 | PARENT2)) == (PARENT1 | PARENT2))
 			continue;
 		else if (commit->flags & PARENT1)
-			(*behind)++;
-		else if (commit->flags & PARENT2)
 			(*ahead)++;
+		else if (commit->flags & PARENT2)
+			(*behind)++;
 
 		for (i = 0; i < commit->out_degree; i++) {
 			git_commit_list_node *p = commit->parents[i];