diff --git a/build.sh b/build.sh
index f2fc98f..787617a 100755
--- a/build.sh
+++ b/build.sh
@@ -71,11 +71,7 @@ cd "$SCRIPT_DIR"
 
 mkdir -p "${EXE_DIR}"
 
-BUILDSTR="amd64"
-
-if [ ! -z "$1" ]; then
-    BUILDSTR="$1"
-fi
+BUILDSTR="${1:-amd64}"
 
 if [ "$BUILDSTR" = "all" ] || [ "$BUILDSTR" = "arm64" ]; then
     title "Building linux-arm64 executable"