diff --git a/polygerrit-ui/app/embed/diff/gr-diff/gr-diff-utils.ts b/polygerrit-ui/app/embed/diff/gr-diff/gr-diff-utils.ts
index c41dc91..7e30581 100644
--- a/polygerrit-ui/app/embed/diff/gr-diff/gr-diff-utils.ts
+++ b/polygerrit-ui/app/embed/diff/gr-diff/gr-diff-utils.ts
@@ -226,7 +226,7 @@
     return FULL_CONTEXT;
   }
   if (
-    prefsContext &&
+    prefsContext !== undefined &&
     !(showFullContext === FullContext.NO && prefsContext === FULL_CONTEXT)
   ) {
     return prefsContext;
diff --git a/polygerrit-ui/app/embed/diff/gr-diff/gr-diff-utils_test.ts b/polygerrit-ui/app/embed/diff/gr-diff/gr-diff-utils_test.ts
index 44f4f60..f425e2b 100644
--- a/polygerrit-ui/app/embed/diff/gr-diff/gr-diff-utils_test.ts
+++ b/polygerrit-ui/app/embed/diff/gr-diff/gr-diff-utils_test.ts
@@ -196,6 +196,12 @@
       assert.equal(computeContext(1, FullContext.UNDECIDED, 2), 1);
     });
 
+    test('computeContext 0', () => {
+      assert.equal(computeContext(0, FullContext.YES, 2), FULL_CONTEXT);
+      assert.equal(computeContext(0, FullContext.NO, 2), 0);
+      assert.equal(computeContext(0, FullContext.UNDECIDED, 2), 0);
+    });
+
     test('computeContext FULL_CONTEXT', () => {
       assert.equal(
         computeContext(FULL_CONTEXT, FullContext.YES, 2),