diff --git a/infra/specs/client.webrtc.json b/infra/specs/client.webrtc.json
index 4eacdeb112..db0d5d4d75 100644
--- a/infra/specs/client.webrtc.json
+++ b/infra/specs/client.webrtc.json
@@ -2009,7 +2009,8 @@
           "dimensions": {
             "cpu": "x86-64",
             "os": "Ubuntu-22.04"
-          }
+          },
+          "shards": 4
         },
         "test": "svc_tests",
         "test_id_prefix": "ninja://pc:svc_tests/"
@@ -2057,7 +2058,8 @@
           "dimensions": {
             "cpu": "x86-64",
             "os": "Ubuntu-22.04"
-          }
+          },
+          "shards": 4
         },
         "test": "video_engine_tests",
         "test_id_prefix": "ninja://:video_engine_tests/"
diff --git a/infra/specs/test_suites.pyl b/infra/specs/test_suites.pyl
index 49b3bc9347..ee2dbc8f96 100644
--- a/infra/specs/test_suites.pyl
+++ b/infra/specs/test_suites.pyl
@@ -119,15 +119,13 @@
       # 'rtc_unittests': {},
       'rtc_pc_unittests': {},
       'svc_tests': {
-        # TODO: b/338087169 - Re-enable sharding.
-        # 'mixins': ['shards-4'],
+        'mixins': ['shards-4'],
       },
       'system_wrappers_unittests': {},
       # TODO(bugs.webrtc.org/14712):  Enable once network issue is fixed.
       # 'peerconnection_unittests': {},
       'video_engine_tests': {
-        # TODO: b/338087169 - Re-enable sharding.
-        # 'mixins': ['shards-4'],
+        'mixins': ['shards-4'],
       },
       'voip_unittests': {},
       'webrtc_nonparallel_tests': {},
diff --git a/infra/specs/tryserver.webrtc.json b/infra/specs/tryserver.webrtc.json
index 98cd16b11e..e448c19dec 100644
--- a/infra/specs/tryserver.webrtc.json
+++ b/infra/specs/tryserver.webrtc.json
@@ -2207,7 +2207,8 @@
           "dimensions": {
             "cpu": "x86-64",
             "os": "Ubuntu-22.04"
-          }
+          },
+          "shards": 4
         },
         "test": "svc_tests",
         "test_id_prefix": "ninja://pc:svc_tests/"
@@ -2255,7 +2256,8 @@
           "dimensions": {
             "cpu": "x86-64",
             "os": "Ubuntu-22.04"
-          }
+          },
+          "shards": 4
         },
         "test": "video_engine_tests",
         "test_id_prefix": "ninja://:video_engine_tests/"