diff --git a/backend/install-sdk.sh b/backend/install-sdk.sh
index 5ebd74c8d..10388c5a3 100755
--- a/backend/install-sdk.sh
+++ b/backend/install-sdk.sh
@@ -8,4 +8,8 @@ if [ "$0" != "./install-sdk.sh" ]; then
 	exit 1
 fi
 
+if [ -z "$OS_ARCH" ]; then
+  OS_ARCH=$(uname -m)
+fi
+
 cargo install --bin=embassy-sdk --bin=embassy-cli --path=. --no-default-features --features=js_engine --locked