diff --git a/src/frontend/numparam/numparam.h b/src/frontend/numparam/numparam.h
index 909d8ebcb..416ab27fb 100644
--- a/src/frontend/numparam/numparam.h
+++ b/src/frontend/numparam/numparam.h
@@ -9,10 +9,7 @@
 
 /***** numparam internals ********/
 
-typedef enum {Nodekey = '#'} _nNodekey;  /* Introduces node symbol */
 typedef enum {Intro   = '&'} _nIntro;    /* Introduces preprocessor tokens */
-typedef enum {Comment = '*'} _nComment;  /* Spice Comment lines */
-typedef enum {Psp     = '{'} _nPsp;      /* Ps expression */
 
 
 /* -----------------------------------------------------------------
diff --git a/src/frontend/numparam/xpressn.c b/src/frontend/numparam/xpressn.c
index e7460f34d..3f8a15f0f 100644
--- a/src/frontend/numparam/xpressn.c
+++ b/src/frontend/numparam/xpressn.c
@@ -1208,7 +1208,7 @@ nupa_substitute(dico_t *dico, char *s, char *r, bool err)
         i++;
         c = s[i - 1];
 
-        if (c == Psp) {
+        if (c == '{') {
             /* try ps expression syntax */
             k = i;
             nnest = 1;