diff --git a/src/deployer.sh b/src/deployer.sh
index dd1a2ff..7be219b 100755
--- a/src/deployer.sh
+++ b/src/deployer.sh
@@ -440,7 +440,7 @@ main() (
 			fail "Deployer process with pid='${pid}' is not running." \
 				"${err_deployer_process_not_running}"
 		fi
-		if ! kill "${pid}" || kill --signal KILL "${pid}"; then
+		if ! kill "${pid}" || kill -KILL "${pid}"; then
 			fail "Cannot kill deployer process." \
 				"${err_deployer_process_not_killed}"
 		fi
diff --git a/src/runner.sh b/src/runner.sh
index d78451e..0a03805 100755
--- a/src/runner.sh
+++ b/src/runner.sh
@@ -541,7 +541,7 @@ main() (
 			fail "Runner process with pid='${pid}' is not running." \
 				"${err_runner_process_not_running}"
 		fi
-		if ! kill "${pid}" || kill --signal KILL "${pid}"; then
+		if ! kill "${pid}" || kill -KILL "${pid}"; then
 			fail "Cannot kill runner process." "${err_runner_process_not_killed}"
 		fi
 		rm --force "${runner_sock}"