diff --git a/apriltag/src/main/native/cpp/AprilTagFieldLayout.cpp b/apriltag/src/main/native/cpp/AprilTagFieldLayout.cpp
index 0baf3b8df7..31e4cacb83 100644
--- a/apriltag/src/main/native/cpp/AprilTagFieldLayout.cpp
+++ b/apriltag/src/main/native/cpp/AprilTagFieldLayout.cpp
@@ -29,7 +29,7 @@ AprilTagFieldLayout::AprilTagFieldLayout(std::string_view path) {
     m_apriltags[tag.ID] = tag;
   }
   m_fieldWidth = units::meter_t{json.at("field").at("width").get<double>()};
-  m_fieldLength = units::meter_t{json.at("field").at("height").get<double>()};
+  m_fieldLength = units::meter_t{json.at("field").at("length").get<double>()};
 }
 
 AprilTagFieldLayout::AprilTagFieldLayout(std::vector<AprilTag> apriltags,