diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 6696c95..301ad95 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,6 +1,6 @@
 name: Build
 
-on: [push, pull_request]
+on: pull_request
 
 jobs:
   build-upload:
@@ -19,5 +19,8 @@ jobs:
           sudo apt-get update
           sudo apt-get -y install libusb-1.0-0 cmake srecord
           pip install -U pyserial
+
       - name: Build
+        env:
+          PR_NUMBER: ${{ github.event.number }}
         run: ./scripts/build-firmware
diff --git a/.gitignore b/.gitignore
index 8c03d32..920a7d8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -51,3 +51,6 @@ private
 
 # NodeMCU
 nodemcu-firmware
+
+# IDE's
+.vscode
diff --git a/scripts/build-firmware b/scripts/build-firmware
index 3e4ad96..11707e8 100755
--- a/scripts/build-firmware
+++ b/scripts/build-firmware
@@ -15,9 +15,13 @@ function usage() {
 set -e
 
 if ! git describe --exact-match --tags &> /dev/null; then
-BRANCH="$(git branch | sed -n -e 's/^\* \(.*\)/\1/p')"
+  if [[ -z "${PR_NUMBER}" ]]; then
+    BRANCH="$(git branch | sed -n -e 's/^\* \(.*\)/\1/p')"
+  else
+    BRANCH="PR-"${PR_NUMBER}
+  fi
 else
-BRANCH="$(git describe --exact-match --tags $(git log -n1 --pretty='%h'))"
+  BRANCH="$(git describe --exact-match --tags $(git log -n1 --pretty='%h'))"
 fi
 
 FW_TAG="3.0.0-release_20210201"