diff --git a/README.md b/README.md
index 1e20729..ecc681f 100644
--- a/README.md
+++ b/README.md
@@ -73,6 +73,17 @@ with:
   snapshot: true
 ```
 
+### default_branch
+Use `default_branch` when you want to use a different branch than `master` as the default branch.
+
+```yaml
+with:
+  name: owner/repository/image
+  username: ${{ secrets.DOCKER_USERNAME }}
+  password: ${{ secrets.DOCKER_PASSWORD }}
+  default_branch: trunk
+```
+
 ### dockerfile
 Use `dockerfile` when you would like to explicitly build a Dockerfile.  
 This might be useful when you have multiple DockerImages.  
diff --git a/action.yml b/action.yml
index 47c1566..290d2ee 100644
--- a/action.yml
+++ b/action.yml
@@ -20,6 +20,9 @@ inputs:
   snapshot:
     description: 'Use snapshot to push an additional image'
     required: false
+  default_branch:
+    description: 'Set the default branch of your repository (default: master)'
+    required: false
   dockerfile:
     description: 'Use dockerfile when you would like to explicitly build a Dockerfile'
     required: false
diff --git a/entrypoint.sh b/entrypoint.sh
index f8ec655..02b783a 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -95,7 +95,7 @@ translateDockerTag() {
   if hasCustomTag; then
     TAGS=$(echo "${INPUT_NAME}" | cut -d':' -f2)
     INPUT_NAME=$(echo "${INPUT_NAME}" | cut -d':' -f1)
-  elif isOnMaster; then
+  elif isOnDefaultBranch; then
     TAGS="latest"
   elif isGitTag && usesBoolean "${INPUT_TAG_SEMVER}" && isSemver "${GITHUB_REF}"; then
     TAGS=$(echo "${GITHUB_REF}" | sed -e "s/refs\/tags\///g" | sed -E "s/v?([0-9]+)\.([0-9]+)\.([0-9]+)(-[a-zA-Z]+(\.[0-9]+)?)?/\1.\2.\3\4 \1.\2\4 \1\4/g")
@@ -114,8 +114,12 @@ hasCustomTag() {
   [ $(echo "${INPUT_NAME}" | sed -e "s/://g") != "${INPUT_NAME}" ]
 }
 
-isOnMaster() {
-  [ "${BRANCH}" = "master" ]
+isOnDefaultBranch() {
+  local DEFAULT_BRANCH="master"
+  if uses "${INPUT_DEFAULT_BRANCH}"; then
+    DEFAULT_BRANCH="${INPUT_DEFAULT_BRANCH}"
+  fi
+  [ "${BRANCH}" = "${DEFAULT_BRANCH}" ]
 }
 
 isGitTag() {
diff --git a/test.bats b/test.bats
index 00fcd96..c312d72 100755
--- a/test.bats
+++ b/test.bats
@@ -614,6 +614,21 @@ teardown() {
 /usr/local/bin/docker logout"
 }
 
+@test "it can change the default branch" {
+  export GITHUB_REF='refs/heads/trunk'
+  export INPUT_DEFAULT_BRANCH='trunk'
+
+  run /entrypoint.sh
+
+  expectStdOutContains "::set-output name=tag::latest"
+
+  expectMockCalledContains "/usr/local/bin/docker login -u USERNAME --password-stdin
+/usr/local/bin/docker build -t my/repository:latest .
+/usr/local/bin/docker push my/repository:latest
+/usr/local/bin/docker inspect --format={{index .RepoDigests 0}} my/repository:latest
+/usr/local/bin/docker logout"
+}
+
 expectStdOutIs() {
   local expected=$(echo "${1}" | tr -d '\n')
   local got=$(echo "${output}" | tr -d '\n')