diff --git a/pygac/gac_klm.py b/pygac/gac_klm.py
index 7d08697..850987d 100644
--- a/pygac/gac_klm.py
+++ b/pygac/gac_klm.py
@@ -127,8 +127,8 @@
                      ("spacecraft_altitude_above_reference_ellipsoid", ">u2"),
                      ("angular_relationships", ">i2", (153, )),
                      ("zero_fill3", ">i2", (3, )),
-                     ("earth_location", [("lats", ">i2"),
-                                         ("lons", ">i2")], (51,)),
+                     ("earth_location", [("lats", ">i4"),
+                                         ("lons", ">i4")], (51,)),
                      ("zero_fill4", ">i4", (2, )),
                      # HRPT MINOR FRAME TELEMETRY
                      ("frame_sync", ">u2", (6, )),
diff --git a/pygac/lac_klm.py b/pygac/lac_klm.py
index d202f6d..2d17df0 100644
--- a/pygac/lac_klm.py
+++ b/pygac/lac_klm.py
@@ -126,8 +126,8 @@
                      ("spacecraft_altitude_above_reference_ellipsoid", ">u2"),
                      ("angular_relationships", ">i2", (153, )),
                      ("zero_fill2", ">i2", (3, )),
-                     ("earth_location", [("lats", ">i2"),
-                                         ("lons", ">i2")], (51,)),
+                     ("earth_location", [("lats", ">i4"),
+                                         ("lons", ">i4")], (51,)),
                      ("zero_fill3", ">i4", (2, )),
                      # HRPT MINOR FRAME TELEMETRY
                      ("frame_sync", ">u2", (6, )),
diff --git a/pygac/tests/test_klm.py b/pygac/tests/test_klm.py
index bc66920..2074a50 100644
--- a/pygac/tests/test_klm.py
+++ b/pygac/tests/test_klm.py
@@ -194,3 +194,14 @@ def test_calibrate_inactive_3b(self):
         """Test calibration of an inactive 3b."""
         channels = self.reader.get_calibrated_channels()
         assert np.all(np.isnan(channels[:, :, 3]))
+
+
+def test_gac_scanline_dtype():
+    """Test the gac scanline size."""
+    from pygac.gac_klm import scanline
+    assert scanline.itemsize == 4608
+
+def test_lac_scanline_dtype():
+    """Test the lac scanline size."""
+    from pygac.lac_klm import scanline
+    assert scanline.itemsize == 15872