diff --git a/src/libcharon/plugins/tnc_imc/tnc_imc_manager.c b/src/libcharon/plugins/tnc_imc/tnc_imc_manager.c
index d2fce6fe6..bdb20d556 100644
--- a/src/libcharon/plugins/tnc_imc/tnc_imc_manager.c
+++ b/src/libcharon/plugins/tnc_imc/tnc_imc_manager.c
@@ -193,7 +193,7 @@ METHOD(imc_manager_t, reserve_id, bool,
 	enumerator = this->imcs->create_enumerator(this->imcs);
 	while (enumerator->enumerate(enumerator, &imc))
 	{
-		if (imc->get_id(imc))
+		if (id == imc->get_id(imc))
 		{
 			found = TRUE;
 			*new_id = this->next_imc_id++;
diff --git a/src/libcharon/plugins/tnc_imv/tnc_imv_manager.c b/src/libcharon/plugins/tnc_imv/tnc_imv_manager.c
index 308285d07..49f51493a 100644
--- a/src/libcharon/plugins/tnc_imv/tnc_imv_manager.c
+++ b/src/libcharon/plugins/tnc_imv/tnc_imv_manager.c
@@ -207,7 +207,7 @@ METHOD(imv_manager_t, reserve_id, bool,
 	enumerator = this->imvs->create_enumerator(this->imvs);
 	while (enumerator->enumerate(enumerator, &imv))
 	{
-		if (imv->get_id(imv))
+		if (id == imv->get_id(imv))
 		{
 			found = TRUE;
 			*new_id = this->next_imv_id++;