diff --git a/.taskcluster.yml b/.taskcluster.yml
index 22c2b0f3f858..a4103c4f0eb0 100644
--- a/.taskcluster.yml
+++ b/.taskcluster.yml
@@ -20,7 +20,7 @@ tasks:
         GECKO_DEV_URL: https://github.com/mozilla/gecko-dev
         MOZCONFIG: ./positron/config/mozconfig
         SHELL: /bin/bash
-      maxRunTime: 10800 # seconds (i.e. three hours)
+      maxRunTime: 14400 # 60 * 60 * 4 seconds (i.e. four hours)
       image: "mykmelez/docker-build-positron:latest"
       command:
         - /bin/bash
@@ -51,7 +51,7 @@ tasks:
         GECKO_DEV_URL: https://github.com/mozilla/gecko-dev
         MOZCONFIG: ./positron/config/mozconfig-debug
         SHELL: /bin/bash
-      maxRunTime: 10800 # seconds (i.e. three hours)
+      maxRunTime: 14400 # 60 * 60 * 4 seconds (i.e. four hours)
       image: "mykmelez/docker-build-positron:latest"
       command:
         - /bin/bash