diff --git a/src/objs/MdisNacSensorModel.cpp b/src/objs/MdisNacSensorModel.cpp
index 8e95258377bfb60460965c11472aaa7adc0c0f5d..6cbb757e35cf1ce8037ad1fae4c2d1e11a2fdfbd 100644
--- a/src/objs/MdisNacSensorModel.cpp
+++ b/src/objs/MdisNacSensorModel.cpp
@@ -320,7 +320,7 @@ double MdisNacSensorModel::getImageTime(const csm::ImageCoord &imagePt) const {
   // check if the image point is in range
   if (imagePt.samp >= m_startingDetectorSample && 
       imagePt.samp <= (m_startingDetectorSample + m_nSamples) &&
-      imagePt.line >= m_startingDetectorSample &&
+      imagePt.line >= m_startingDetectorLine &&
       imagePt.line <= (m_startingDetectorLine + m_nLines)) {
     return m_ephemerisTime;
   }
@@ -335,7 +335,7 @@ csm::EcefCoord MdisNacSensorModel::getSensorPosition(const csm::ImageCoord &imag
   // check if the image point is in range
   if (imagePt.samp >= m_startingDetectorSample && 
       imagePt.samp <= (m_startingDetectorSample + m_nSamples) &&
-      imagePt.line >= m_startingDetectorSample &&
+      imagePt.line >= m_startingDetectorLine &&
       imagePt.line <= (m_startingDetectorLine + m_nLines)) {
     csm::EcefCoord sensorPosition;
     sensorPosition.x = m_spacecraftPosition[0];