--- a/taskcluster/ci/test/tests.yml
+++ b/taskcluster/ci/test/tests.yml
@@ -277,16 +277,17 @@ jsreftest:
             macosx.*: 2
             default: 3
     e10s:
         by-test-platform:
             # Bug 1321782
             windows.*: false
             android.*: false
             linux64-ccov/opt: false
+            macosx.*: true
             default: both
     max-run-time:
         by-test-platform:
             android.*: 7200
             default: 3600
     run-on-projects:
         by-test-platform:
             windows.*: ['mozilla-central', 'try']
@@ -834,17 +835,17 @@ mochitest-webgl:
     treeherder-symbol: tc-M(gl)
     docker-image: {"in-tree": "desktop1604-test"}
     chunks:
         by-test-platform:
             android.*: 10
             default: 3
     e10s:
       by-test-platform:
-        macosx64/opt: false
+        macosx.*: true
         default: both
     loopback-video: true
     max-run-time:
         by-test-platform:
             android.*: 7200
             default: 3600
     instance-size:
         by-test-platform:
@@ -917,16 +918,17 @@ reftest:
             default: 8
     max-run-time:
         by-test-platform:
             android.*: 10800
             default: 3600
     e10s:
         by-test-platform:
             linux64-ccov/opt: false
+            macosx.*: true
             default: both
     mozharness:
         by-test-platform:
             android.*:
                 script: android_emulator_unittest.py
                 no-read-buildbot-config: true
                 config:
                     - android/androidarm_4_3.py
@@ -1233,16 +1235,17 @@ web-platform-tests-reftests:
     suite: web-platform-tests-reftests
     treeherder-symbol: tc-W(Wr)
     max-run-time: 5400
     instance-size: xlarge
     e10s:
         by-test-platform:
             # Bug 1304438
             windows.*: false
+            macosx.*: true
             default: both
     docker-image: {"in-tree": "desktop1604-test"}
     checkout: true
     run-on-projects:
         by-test-platform:
             windows.*: ['mozilla-central', 'try']
             default: ['all']
     mozharness: