diff --git a/tests/libqos/fw_cfg.c b/tests/libqos/fw_cfg.c
index d0889d1e22..c6839c53c8 100644
--- a/tests/libqos/fw_cfg.c
+++ b/tests/libqos/fw_cfg.c
@@ -81,6 +81,11 @@ QFWCFG *mm_fw_cfg_init(QTestState *qts, uint64_t base)
     return fw_cfg;
 }
 
+void mm_fw_cfg_uninit(QFWCFG *fw_cfg)
+{
+    g_free(fw_cfg);
+}
+
 static void io_fw_cfg_select(QFWCFG *fw_cfg, uint16_t key)
 {
     qtest_outw(fw_cfg->qts, fw_cfg->base, key);
@@ -107,3 +112,8 @@ QFWCFG *io_fw_cfg_init(QTestState *qts, uint16_t base)
 
     return fw_cfg;
 }
+
+void io_fw_cfg_uninit(QFWCFG *fw_cfg)
+{
+    g_free(fw_cfg);
+}
diff --git a/tests/libqos/fw_cfg.h b/tests/libqos/fw_cfg.h
index 0353416af0..391669031a 100644
--- a/tests/libqos/fw_cfg.h
+++ b/tests/libqos/fw_cfg.h
@@ -33,7 +33,9 @@ uint32_t qfw_cfg_get_u32(QFWCFG *fw_cfg, uint16_t key);
 uint64_t qfw_cfg_get_u64(QFWCFG *fw_cfg, uint16_t key);
 
 QFWCFG *mm_fw_cfg_init(QTestState *qts, uint64_t base);
+void mm_fw_cfg_uninit(QFWCFG *fw_cfg);
 QFWCFG *io_fw_cfg_init(QTestState *qts, uint16_t base);
+void io_fw_cfg_uninit(QFWCFG *fw_cfg);
 
 static inline QFWCFG *pc_fw_cfg_init(QTestState *qts)
 {