diff --git a/tests/actions/test_copyoverlay.py b/tests/actions/test_copyoverlay.py
index 3509ba6..371813e 100644
--- a/tests/actions/test_copyoverlay.py
+++ b/tests/actions/test_copyoverlay.py
@@ -19,7 +19,11 @@ import fsleyes.actions.copyoverlay as copyoverlay
 
 from .. import run_with_orthopanel, realYield
 
+import pytest
 
+@pytest.mark.skip(reason="Known to fail on Gentoo:"
+    "https://github.com/pauldmccarthy/fsleyes/issues/38"
+    )
 def test_copyImage_3d():
     run_with_orthopanel(_test_copyImage_3d)
 def _test_copyImage_3d(panel, overlayList, displayCtx):
@@ -103,7 +107,9 @@ def _test_copyImage_3d(panel, overlayList, displayCtx):
     assert np.all(copy[5:25, 5:25, 5:25] == img3d[:, :, :])
     overlayList.remove(copy)
 
-
+@pytest.mark.skip(reason="Known to fail on Gentoo:"
+    "https://github.com/pauldmccarthy/fsleyes/issues/38"
+    )
 def test_copyImage_4d():
     run_with_orthopanel(_test_copyImage_4d)
 def _test_copyImage_4d(panel, overlayList, displayCtx):
@@ -220,6 +226,9 @@ def make_rgb():
     return fslimage.Image(rgb, xform=np.eye(4))
 
 
+@pytest.mark.skip(reason="Known to fail on Gentoo:"
+    "https://github.com/pauldmccarthy/fsleyes/issues/38"
+    )
 def test_copyImage_multiValued():
     run_with_orthopanel(_test_copyImage_multiValued)
 def _test_copyImage_multiValued(panel, overlayList, displayCtx):
@@ -281,6 +290,9 @@ def _test_copyImage_multiValued(panel, overlayList, displayCtx):
     overlayList.remove(copy)
 
 
+@pytest.mark.skip(reason="Known to fail on Gentoo:"
+    "https://github.com/pauldmccarthy/fsleyes/issues/38"
+    )
 def test_CopyOverlayAction():
     run_with_orthopanel(_test_CopyOverlayAction)
 def _test_CopyOverlayAction(panel, overlayList, displayCtx):
diff --git a/tests/actions/test_newimage.py b/tests/actions/test_newimage.py
index cfd6b5a..e9c2ff8 100644
--- a/tests/actions/test_newimage.py
+++ b/tests/actions/test_newimage.py
@@ -82,6 +82,9 @@ def test_newImage():
     assert        img.name          == 'whaa'
 
 
+@pytest.mark.skip(reason="Known to fail on Gentoo:"
+    "https://github.com/pauldmccarthy/fsleyes/issues/38"
+    )
 def test_NewImageAction():
     run_with_orthopanel(_test_NewImageAction)