diff --git a/src/xspice/cmpp/cmpp.h b/src/xspice/cmpp/cmpp.h
index 00bbaa207..5d3865a86 100644
--- a/src/xspice/cmpp/cmpp.h
+++ b/src/xspice/cmpp/cmpp.h
@@ -301,6 +301,7 @@ Status_t write_ifs_c_file(const char *filename, Ifs_Table_t *ifs_table);
 
 FILE *fopen_cmpp(const char **path_p, const char *mode);
 
+void rem_ifs_table(Ifs_Table_t *ifs_table);
 
 /*
  * type safe variants of the <ctype.h> functions for char arguments
diff --git a/src/xspice/cmpp/pp_ifs.c b/src/xspice/cmpp/pp_ifs.c
index 00ba1dc9a..f0830b51a 100644
--- a/src/xspice/cmpp/pp_ifs.c
+++ b/src/xspice/cmpp/pp_ifs.c
@@ -44,6 +44,11 @@ NON-STANDARD FEATURES
 
 /* *********************************************************************** */
 
+static void txfree(void *ptr)
+{
+    if(ptr)
+        free(ptr);
+};
 
 /*
 preprocess_ifs_file
@@ -65,7 +70,6 @@ void preprocess_ifs_file(void)
 
     Status_t        status;      /* Return status */
 
-
     /* Read the entire ifspec.ifs file and load the data into ifs_table */
 
     status = read_ifs_file(IFSPEC_FILENAME,GET_IFS_TABLE,&ifs_table);
@@ -82,7 +86,34 @@ void preprocess_ifs_file(void)
     if(status != OK) {
         exit(1);
     }
+    rem_ifs_table(&ifs_table);
+}
 
+void rem_ifs_table(Ifs_Table_t *ifs_table)
+{
+    int i;
+    /* Remove the ifs_table */
+    txfree(ifs_table->name.c_fcn_name);
+    txfree(ifs_table->name.description);
+    txfree(ifs_table->name.model_name);
+
+    for(i = 0; i < ifs_table->num_conn; i++) {
+        txfree(ifs_table->conn[i].name);
+        txfree(ifs_table->conn[i].description);
+        txfree(ifs_table->conn[i].default_type);              
+    }
+
+    for(i = 0; i < ifs_table->num_param; i++) {
+        txfree(ifs_table->param[i].name);
+        txfree(ifs_table->param[i].description);        
+    }
+    for(i = 0; i < ifs_table->num_inst_var; i++) {
+        txfree(ifs_table->inst_var[i].name);
+        txfree(ifs_table->inst_var[i].description);        
+    }
+    txfree(ifs_table->conn);
+    txfree(ifs_table->param);
+    txfree(ifs_table->inst_var);
 }
 
 
diff --git a/src/xspice/cmpp/pp_lst.c b/src/xspice/cmpp/pp_lst.c
index 257bb3581..5c3b3b02f 100644
--- a/src/xspice/cmpp/pp_lst.c
+++ b/src/xspice/cmpp/pp_lst.c
@@ -193,7 +193,16 @@ void preprocess_lst_files(void)
     if(status != OK) {
         exit(1);
     }
-
+    /* remove model_info and node_info */
+    if (model_info) {
+        if(model_info->cfunc_name) free(model_info->cfunc_name);
+        if(model_info->path_name) free(model_info->path_name);
+        if(model_info->spice_name) free(model_info->spice_name);        
+    }
+    if (node_info) {
+        if(node_info->node_name) free(node_info->node_name);
+        if(node_info->path_name) free(node_info->path_name);
+    }
 }
 
 
@@ -309,6 +318,9 @@ static Status_t read_modpath(
     *num_models = n;
     *model_info = model;
 
+    if(filename)
+        free((char*)filename);
+
     return(OK);
 
 }
@@ -424,6 +436,9 @@ static Status_t read_udnpath(
     *num_nodes = n;
     *node_info = node;
 
+    if(filename)
+        free((char*)filename);
+
     return(OK);
 
 }
@@ -467,14 +482,17 @@ static Status_t read_model_names(
 
         /* Transfer the names into the model_info structure */
         if(status == OK) {
-            model_info[i].spice_name = ifs_table.name.model_name;
-            model_info[i].cfunc_name = ifs_table.name.c_fcn_name;
+            model_info[i].spice_name = strdup(ifs_table.name.model_name);
+            model_info[i].cfunc_name = strdup(ifs_table.name.c_fcn_name);
         }
         else {
             all_found = FALSE;
             print_error("ERROR - Problems reading %s in directory %s",
                         IFSPEC_FILENAME, model_info[i].path_name);
         }
+
+        /* Remove the ifs_table */
+        rem_ifs_table(&ifs_table);
     }
 
     if(all_found)
@@ -767,6 +785,8 @@ static Status_t write_CMextrn(
 
     /* Close the file and return */
     fclose(fp);
+    if(filename)
+        free((char*)filename);
     return(OK);
 }
 
@@ -808,6 +828,8 @@ static Status_t write_CMinfo(
 
     /* Close the file and return */
     fclose(fp);
+    if(filename)
+        free((char*)filename);
     return(OK);
 }
 
@@ -853,6 +875,8 @@ static Status_t write_UDNextrn(
 
     /* Close the file and return */
     fclose(fp);
+    if(filename)
+        free((char*)filename);  
     return(OK);
 }
 
@@ -895,6 +919,8 @@ static Status_t write_UDNinfo(
     }
 
     /* Close the file and return */
+    if(filename)
+        free((char*)filename);
     fclose(fp);
     return(OK);
 }
@@ -947,6 +973,8 @@ static Status_t write_objects_inc(
 
     /* Close the file and return */
     fclose(fp);
+    if(filename)
+        free((char*)filename);
     return(OK);
 }
 
@@ -976,6 +1004,7 @@ static Status_t read_udn_type_name(
 
     /* Open the file from which the node type name will be read */
     fp = fopen_cmpp(&path, "r");
+    free((char*)path);
     if(fp == NULL)
         return(ERROR);
 
diff --git a/src/xspice/cmpp/pp_mod.c b/src/xspice/cmpp/pp_mod.c
index 4b2436b91..240371ed6 100644
--- a/src/xspice/cmpp/pp_mod.c
+++ b/src/xspice/cmpp/pp_mod.c
@@ -159,7 +159,10 @@ void preprocess_mod_file (
       exit (1);
    }
    fclose (mod_yyout);
-   mod_yyrestart(NULL);
+    if(output_filename)
+        free((char*)output_filename);
+    rem_ifs_table(&ifs_table);
+    mod_yyrestart(NULL);
 }
 
 /*---------------------------------------------------------------------------*/
diff --git a/src/xspice/cmpp/read_ifs.c b/src/xspice/cmpp/read_ifs.c
index 2dd038b81..9a2bb0197 100644
--- a/src/xspice/cmpp/read_ifs.c
+++ b/src/xspice/cmpp/read_ifs.c
@@ -150,6 +150,10 @@ static Status_t read_ifs_table(
    assert (ifs_table);
    assert (fp);
 
+   ifs_table->name.description = 
+   ifs_table->name.c_fcn_name = 
+   ifs_table->name.model_name = NULL;
+
    ifs_yylineno = 1;
    ifs_yyin = fp;
    parser_just_names = (mode == GET_IFS_NAME) ? TRUE : FALSE;
diff --git a/src/xspice/cmpp/writ_ifs.c b/src/xspice/cmpp/writ_ifs.c
index 00ff98575..a09f61c99 100644
--- a/src/xspice/cmpp/writ_ifs.c
+++ b/src/xspice/cmpp/writ_ifs.c
@@ -155,7 +155,8 @@ Status_t write_ifs_c_file(
     /* Close the ifspec.c file and return */
 
     int_status = fclose(fp);
-
+    if(filename)
+        free((char*)filename);
     if(int_status == 0)
         return(OK);
     else