diff --git a/.circleci/config.yml b/.circleci/config.yml
index 55c53b3746..f4f1be7bef 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -17,7 +17,11 @@
 # **NOTE 2**: If you change the version of the docker images, also change the `cache_key` suffix.
 var_1: &default_docker_image circleci/node:10.12
 var_2: &browsers_docker_image circleci/node:10.12-browsers
-var_3: &cache_key v2-angular-{{ .Branch }}-{{ checksum "yarn.lock" }}-node-10.12
+# We don't want to include the current branch name in the cache key because that would prevent
+# PRs from being able to restore the cache since the branch names are always different for PRs.
+# The cache key should only consist of dynamic values that change whenever something in the
+# cache changes. (e.g. Yarn lock file changes --> cached "node_modules" are different).
+var_3: &cache_key v2-angular-{{ checksum "yarn.lock" }}-node-10.12
 
 # Define common ENV vars
 var_4: &define_env_vars