diff --git a/src/spicelib/devices/bsim3/b3dest.c b/src/spicelib/devices/bsim3/b3dest.c
index b77ea5082..d01bdb87c 100644
--- a/src/spicelib/devices/bsim3/b3dest.c
+++ b/src/spicelib/devices/bsim3/b3dest.c
@@ -35,7 +35,10 @@ BSIM3destroy(
         FREE(pParamOld);
         pParam = NULL;
      /** end of extra code **/
-        if(oldmod) FREE(oldmod);
+        if(oldmod) {
+            FREE(oldmod->BSIM3version);
+            FREE(oldmod);
+        }
         oldmod = mod;
         prev = NULL;
         for (here = mod->BSIM3instances; here; here = here->BSIM3nextInstance) {
@@ -49,6 +52,8 @@ BSIM3destroy(
         /* free just once for all models */
         FREE(oldmod->BSIM3InstanceArray);
 #endif
+        /* oldmod->BSIM3modName to be freed in INPtabEnd() */
+        FREE(oldmod->BSIM3version);
         FREE(oldmod);
     }
     *model = NULL;
diff --git a/src/spicelib/devices/bsim3/b3set.c b/src/spicelib/devices/bsim3/b3set.c
index 46c2b7698..4d2d753be 100644
--- a/src/spicelib/devices/bsim3/b3set.c
+++ b/src/spicelib/devices/bsim3/b3set.c
@@ -80,7 +80,7 @@ BSIM3instance **InstArray;
             printf("Warning: acnqsMod has been set to its default value: 0.\n");
         }
         if (!model->BSIM3versionGiven)
-            model->BSIM3version = "3.3.0";
+            model->BSIM3version = copy("3.3.0");
         if (!model->BSIM3toxGiven)
             model->BSIM3tox = 150.0e-10;
         model->BSIM3cox = 3.453133e-11 / model->BSIM3tox;