diff --git a/tests/_test_save_load_encrypted_state b/tests/_test_save_load_encrypted_state
index a5170163..9086ba90 100755
--- a/tests/_test_save_load_encrypted_state
+++ b/tests/_test_save_load_encrypted_state
@@ -39,9 +39,11 @@ source ${TESTDIR}/common
 
 rm -f $STATE_FILE $VOLATILE_STATE_FILE 2>/dev/null
 
+exec 101<$keyfile
 run_swtpm ${SWTPM_INTERFACE} \
-	--key file=$keyfile,mode=aes-cbc,format=hex \
+	--key fd=101,mode=aes-cbc,format=hex \
 	--log file=$logfile
+exec 101>&-
 
 display_processes_by_name "$SWTPM"