diff --git a/src/spicelib/devices/bsim3/b3set.c b/src/spicelib/devices/bsim3/b3set.c
index 3480b47ee..5c2220f4d 100644
--- a/src/spicelib/devices/bsim3/b3set.c
+++ b/src/spicelib/devices/bsim3/b3set.c
@@ -1169,6 +1169,11 @@ BSIM3unsetup(
     BSIM3model *model;
     BSIM3instance *here;
 
+#ifdef USE_OMP
+    model = (BSIM3model*)inModel;
+    tfree(model->BSIM3InstanceArray);
+#endif
+
     for (model = (BSIM3model *)inModel; model != NULL;
             model = BSIM3nextModel(model))
     {
diff --git a/src/spicelib/devices/bsim3v32/b3v32set.c b/src/spicelib/devices/bsim3v32/b3v32set.c
index e0c0cd43a..919b0f2ee 100644
--- a/src/spicelib/devices/bsim3v32/b3v32set.c
+++ b/src/spicelib/devices/bsim3v32/b3v32set.c
@@ -1181,6 +1181,11 @@ BSIM3v32unsetup(
     BSIM3v32model *model;
     BSIM3v32instance *here;
 
+#ifdef USE_OMP
+    model = (BSIM3v32model*)inModel;
+    tfree(model->BSIM3v32InstanceArray);
+#endif
+
     for (model = (BSIM3v32model *)inModel; model != NULL;
             model = BSIM3v32nextModel(model))
     {
diff --git a/src/spicelib/devices/bsim4/b4set.c b/src/spicelib/devices/bsim4/b4set.c
index 01d16d8a4..c721d8d8c 100644
--- a/src/spicelib/devices/bsim4/b4set.c
+++ b/src/spicelib/devices/bsim4/b4set.c
@@ -2761,6 +2761,11 @@ CKTcircuit *ckt)
     BSIM4model *model;
     BSIM4instance *here;
 
+#ifdef USE_OMP
+    model = (BSIM4model*)inModel;
+    tfree(model->BSIM4InstanceArray);
+#endif
+
     for (model = (BSIM4model *)inModel; model != NULL;
             model = BSIM4nextModel(model))
     {
diff --git a/src/spicelib/devices/bsim4v5/b4v5set.c b/src/spicelib/devices/bsim4v5/b4v5set.c
index 1f26487e2..8c971d8f8 100644
--- a/src/spicelib/devices/bsim4v5/b4v5set.c
+++ b/src/spicelib/devices/bsim4v5/b4v5set.c
@@ -2139,6 +2139,11 @@ BSIM4v5unsetup(
     BSIM4v5model *model;
     BSIM4v5instance *here;
 
+#ifdef USE_OMP
+    model = (BSIM4v5model*)inModel;
+    tfree(model->BSIM4v5InstanceArray);
+#endif
+
     for (model = (BSIM4v5model *)inModel; model != NULL;
             model = BSIM4v5nextModel(model))
     {
diff --git a/src/spicelib/devices/bsim4v6/b4v6set.c b/src/spicelib/devices/bsim4v6/b4v6set.c
index 1fa4deee0..405a70499 100644
--- a/src/spicelib/devices/bsim4v6/b4v6set.c
+++ b/src/spicelib/devices/bsim4v6/b4v6set.c
@@ -2472,6 +2472,11 @@ BSIM4v6unsetup(GENmodel *inModel, CKTcircuit *ckt)
     BSIM4v6model *model;
     BSIM4v6instance *here;
 
+#ifdef USE_OMP
+    model = (BSIM4v6model*)inModel;
+    tfree(model->BSIM4v6InstanceArray);
+#endif
+
     for (model = (BSIM4v6model *)inModel; model != NULL;
             model = BSIM4v6nextModel(model))
     {
diff --git a/src/spicelib/devices/bsim4v7/b4v7set.c b/src/spicelib/devices/bsim4v7/b4v7set.c
index f768d7fb3..07909c9cd 100644
--- a/src/spicelib/devices/bsim4v7/b4v7set.c
+++ b/src/spicelib/devices/bsim4v7/b4v7set.c
@@ -2629,6 +2629,11 @@ CKTcircuit *ckt)
     BSIM4v7model *model;
     BSIM4v7instance *here;
 
+#ifdef USE_OMP
+    model = (BSIM4v7model*)inModel;
+    tfree(model->BSIM4v7InstanceArray);
+#endif
+
     for (model = (BSIM4v7model *)inModel; model != NULL;
             model = BSIM4v7nextModel(model))
     {
diff --git a/src/spicelib/devices/bsimsoi/b4soiset.c b/src/spicelib/devices/bsimsoi/b4soiset.c
index 70965f5f2..3523eae74 100644
--- a/src/spicelib/devices/bsimsoi/b4soiset.c
+++ b/src/spicelib/devices/bsimsoi/b4soiset.c
@@ -2766,6 +2766,11 @@ B4SOIunsetup(
     B4SOImodel *model;
     B4SOIinstance *here;
 
+#ifdef USE_OMP
+    model = (B4SOImodel*)inModel;
+    tfree(model->B4SOIInstanceArray);
+#endif
+
     for (model = (B4SOImodel *)inModel; model != NULL;
             model = B4SOInextModel(model))
     {