diff --git a/pki/icinga2-setup-agent.cmake b/pki/icinga2-setup-agent.cmake
index ffc6b124e..6e5ef65f5 100644
--- a/pki/icinga2-setup-agent.cmake
+++ b/pki/icinga2-setup-agent.cmake
@@ -14,7 +14,7 @@ if [ -n "$1" ]; then
 		exit 1
 	fi
 
-	if ! base64 -d $1 2>/dev/null; then
+	if ! base64 -d $1 >/dev/null 2>&1; then
 		echo "The bundle file is invalid or corrupted."
 		exit 1
 	fi