diff --git a/include/ceres/jet.h b/include/ceres/jet.h
index f9997bd..552df65 100644
--- a/include/ceres/jet.h
+++ b/include/ceres/jet.h
@@ -509,7 +509,7 @@
     return true;
   }
   for (int i = 0; i < N; i++) {
-    if (IsFinite(f.v[i])) {
+    if (IsInfinite(f.v[i])) {
       return true;
     }
   }