diff --git a/src/frontend/numparam/numparam.h b/src/frontend/numparam/numparam.h
index 05c93b33d..dce89514c 100644
--- a/src/frontend/numparam/numparam.h
+++ b/src/frontend/numparam/numparam.h
@@ -51,6 +51,7 @@ typedef struct {                /* the input scanner data structure */
     char **dynrefptr;
     char *dyncategory;
     int hs_compatibility;       /* allow extra keywords */
+    int linecount;              /* number of lines in deck */
 } dico_t;
 
 
diff --git a/src/frontend/numparam/spicenum.c b/src/frontend/numparam/spicenum.c
index 1a7cb7160..2851423ae 100644
--- a/src/frontend/numparam/spicenum.c
+++ b/src/frontend/numparam/spicenum.c
@@ -320,6 +320,8 @@ nupa_init(void)
         dicoS->dynrefptr[i] = NULL;
         dicoS->dyncategory[i] = '?';
     }
+
+    dicoS->linecount = dynmaxline;
 }
 
 
@@ -332,6 +334,9 @@ nupa_del_dicoS(void)
     if(!dicoS)
         return;
 
+    for (i = dicoS->linecount; i >= 0; i--)
+        txfree(dicoS->dynrefptr[i]);
+
     txfree(dicoS->dynrefptr);
     txfree(dicoS->dyncategory);
     txfree(dicoS->inst_name);