diff --git a/src/translators/btparse/ast.c b/src/translators/btparse/ast.c
index d433f79..cec919a 100644
--- a/src/translators/btparse/ast.c
+++ b/src/translators/btparse/ast.c
@@ -157,7 +157,7 @@ zzfree_ast(AST *tree)
 AST *zztmake(AST *rt, ...)
 {
 	va_list ap;
-	register AST *child, *sibling=NULL, *tail, *w;
+	AST *child, *sibling=NULL, *tail, *w;
 	AST *root;
 
 	va_start(ap, rt);
diff --git a/src/translators/btparse/dlgauto.h b/src/translators/btparse/dlgauto.h
index efcc3b2..fb6d9a6 100644
--- a/src/translators/btparse/dlgauto.h
+++ b/src/translators/btparse/dlgauto.h
@@ -240,9 +240,9 @@ zzreplchar(zzchar_t c)
 
 /* replace the string s for the reg. expr last matched and in the buffer */
 void
-zzreplstr(register zzchar_t *s)
+zzreplstr(zzchar_t *s)
 {
-	register zzchar_t *l= &zzlextext[zzbufsize -1];
+	zzchar_t *l= &zzlextext[zzbufsize -1];
 
 	zznextpos = zzbegexpr;
 	if (s){
@@ -264,7 +264,7 @@ zzreplstr(register zzchar_t *s)
 void
 zzgettok()
 {
-	register int state, newstate;
+	int state, newstate;
 	/* last space reserved for the null char */
 	zzchar_t *lastpos;           /* GPW 1997/09/05 (removed 'register' */
 
diff --git a/src/translators/btparse/err.h b/src/translators/btparse/err.h
index d16615d..0717b9c 100644
--- a/src/translators/btparse/err.h
+++ b/src/translators/btparse/err.h
@@ -230,14 +230,14 @@ zzrestore_antlr_state(zzantlr_state *buf)
 void
 zzedecode(SetWordType *a)
 {
-        register SetWordType *p = a;
-        register SetWordType *endp = &(p[zzSET_SIZE]);
-        register unsigned e = 0;
+        SetWordType *p = a;
+        SetWordType *endp = &(p[zzSET_SIZE]);
+        unsigned e = 0;
 
         if ( zzset_deg(a)>1 ) fprintf(stderr, " {");
         do {
-                register SetWordType t = *p;
-                register SetWordType *b = &(bitmask[0]);
+                SetWordType t = *p;
+                SetWordType *b = &(bitmask[0]);
                 do {
                         if ( t & *b ) fprintf(stderr, " %s", zztokens[e]);
                         e++;
@@ -281,15 +281,15 @@ zzset_deg(SetWordType *a)
            of elements present in the set.  Assumes
            that all word bits are used in the set
         */
-        register SetWordType *p = a;
-        register SetWordType *endp = &(a[zzSET_SIZE]);
-        register int degree = 0;
+        SetWordType *p = a;
+        SetWordType *endp = &(a[zzSET_SIZE]);
+        int degree = 0;
 
         if ( a == NULL ) return 0;
         while ( p < endp )
         {
-                register SetWordType t = *p;
-                register SetWordType *b = &(bitmask[0]);
+                SetWordType t = *p;
+                SetWordType *b = &(bitmask[0]);
                 do {
                         if (t & *b) ++degree;
                 } while (++b < &(bitmask[sizeof(SetWordType)*8]));
diff --git a/src/translators/btparse/sym.c b/src/translators/btparse/sym.c
index 2426dea..610bd2f 100644
--- a/src/translators/btparse/sym.c
+++ b/src/translators/btparse/sym.c
@@ -175,10 +175,10 @@ zzs_done(void)
 }
 
 void
-zzs_add(char *key, register Sym *rec)
+zzs_add(char *key, Sym *rec)
 {
-    register unsigned int h=0;
-    register char *p=key;
+    unsigned int h=0;
+    char *p=key;
     
     HASH_FUN(p, h);
     rec->hash = h;                  /* save hash code for fast comp later */
@@ -195,9 +195,9 @@ zzs_add(char *key, register Sym *rec)
 Sym *
 zzs_get(char *key)
 {
-    register unsigned int h=0;
-    register char *p=key;
-    register Sym *q;
+    unsigned int h=0;
+    char *p=key;
+    Sym *q;
     
     HASH_FUN(p, h);
     
@@ -219,12 +219,12 @@ zzs_get(char *key)
  * Will do nothing if all list pointers are NULL
  */
 void
-zzs_del(register Sym *p)
+zzs_del(Sym *p)
 {
     if ( p == NULL ) {fprintf(stderr, "zzs_del(NULL)\n"); exit(1);}
     if ( p->prev == NULL )  /* Head of list */
     {
-        register Sym **t = p->head;
+        Sym **t = p->head;
         
         if ( t == NULL ) return;    /* not part of symbol table */
         (*t) = p->next;
@@ -260,9 +260,9 @@ zzs_scope(Sym **scope)
 
 /* Remove a scope described by 'scope'.  Return pointer to 1st element in scope */
 Sym *
-zzs_rmscope(register Sym **scope)
+zzs_rmscope(Sym **scope)
 {
-    register Sym *p;
+    Sym *p;
     Sym *start;
 
     if ( scope == NULL ) return(NULL);
@@ -277,13 +277,13 @@ zzs_stat(void)
 {
     static unsigned short count[20];
     unsigned int i,n=0,low=0, hi=0;
-    register Sym **p;
+    Sym **p;
     float avg=0.0;
     
     for (i=0; i<20; i++) count[i] = 0;
     for (p=table; p<&(table[size]); p++)
     {
-        register Sym *q = *p;
+        Sym *q = *p;
         unsigned int len;
         
         if ( q != NULL && low==0 ) low = p-table;
@@ -328,7 +328,7 @@ Sym *
 zzs_new(char *text)
 {
     Sym *p;
-    char *zzs_strdup(register char *s);
+    char *zzs_strdup(char *s);
     
     if ( (p = (Sym *) calloc(1,sizeof(Sym))) == 0 )
     {
@@ -353,9 +353,9 @@ zzs_newadd(char *text)
  * Bump the pointer into the string table to next avail position.
  */
 char *
-zzs_strdup(register char *s)
+zzs_strdup(char *s)
 {
-    register char *start=strp;
+    char *start=strp;
 
     while ( *s != '\0' )
     {