diff --git a/scripts/build.sh b/scripts/build.sh
index 9f7384c433b354d9d3f2ca539709effed74976dd..91ef626e2e3867be06f4c9a3d8747d9445b1ac31 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -99,7 +99,9 @@ if [[ -n "${CMAKE_TOOLCHAIN_FILE}" ]]; then
     )
 fi
 
-cmake_config_args+=("${EXTRA_CMAKE_ARGS_ARRAY[@]}")
+if [[ -n "${EXTRA_CMAKE_ARGS_ARRAY-}" ]]; then
+    cmake_config_args+=("${EXTRA_CMAKE_ARGS_ARRAY[@]}")
+fi
 
 "${CMAKE}" "${cmake_config_args[@]}"