diff --git a/isis/tests/FunctionalTestsGrid.cpp b/isis/tests/FunctionalTestsGrid.cpp
index 86ce07b0dd5c53b209395ade85f927f98b1d5f49..7955ec49e37b10276f28b97ce168d3cebb10bc53 100644
--- a/isis/tests/FunctionalTestsGrid.cpp
+++ b/isis/tests/FunctionalTestsGrid.cpp
@@ -263,7 +263,15 @@ TEST_F(NewHorizonsCube, FunctionalTestGridBandDependent) {
 TEST_F(DefaultCube, FunctionalTestGridExtend) {
   QVector<QString> args = {"to=" + tempDir.path() + "/output.cub", "extendgrid=true"};
   UserInterface options(APP_XML, args);
-  grid(testCube, options);
+
+  // change mapping group of cube to one that extends past longitude domain
+  Pvl newMap;
+  newMap.read("data/defaultImage/extendProj.map");
+  PvlGroup &newMapGrp = newMap.findGroup("Mapping", Pvl::Traverse);
+
+  projTestCube->putGroup(newMapGrp);
+
+  grid(projTestCube, options);
 
   Cube outputCube;
   try {
@@ -275,13 +283,13 @@ TEST_F(DefaultCube, FunctionalTestGridExtend) {
 
   // Check beginning and end of gridline
   LineManager line(outputCube);
-  line.SetLine(579);
+  line.SetLine(1);
   outputCube.read(line);
   EXPECT_EQ(line[0], Isis::Hrs);
 
-  line.SetLine(1056);
+  line.SetLine(1);
   outputCube.read(line);
-  EXPECT_EQ(line[247], Isis::Hrs);
+  EXPECT_EQ(line[2], Isis::Hrs);
 
   outputCube.close();
 }
diff --git a/isis/tests/data/defaultImage/extendProj.map b/isis/tests/data/defaultImage/extendProj.map
new file mode 100755
index 0000000000000000000000000000000000000000..a4b7495659d937cbb693c9779e61b37e07b4599b
--- /dev/null
+++ b/isis/tests/data/defaultImage/extendProj.map
@@ -0,0 +1,18 @@
+Group = Mapping
+  ProjectionName     = Sinusoidal
+  CenterLongitude    = 370.0 <degrees>
+  TargetName         = MARS
+  EquatorialRadius   = 3396190.0 <meters>
+  PolarRadius        = 3376200.0 <meters>
+  LatitudeType       = Planetocentric
+  LongitudeDirection = PositiveEast
+  LongitudeDomain    = 360 <degrees>
+  MinimumLatitude    = 0 <degrees>
+  MaximumLatitude    = 10 <degrees>
+  MinimumLongitude   = 361 <degrees>
+  MaximumLongitude   = 380 <degrees>
+  UpperLeftCornerX   = 0.0 <meters>
+  UpperLeftCornerY   = 600000.0 <meters>
+  PixelResolution    = 100000.0 <meters/pixel>
+  Scale              = 0.59274697523306 <pixels/degree>
+End_Group