diff --git a/.github/workflows/ballfield.yml b/.github/workflows/ballfield.yml
index 6a4a9fa9e..dc979f2c8 100644
--- a/.github/workflows/ballfield.yml
+++ b/.github/workflows/ballfield.yml
@@ -28,7 +28,7 @@ on:
 jobs:
   build:
     env:
-      APP_NAME=ballfield
+      APP_NAME: ballfield
       # It takes one hour per one architecture to build Boost and ICU libraries, and Github limits CI script duration to 6 hours
       ARCH_LIST: armeabi-v7a arm64-v8a x86 x86_64