diff --git a/lib/asn1/lex.l b/lib/asn1/lex.l
index cb9dd4d42..4397e1bbb 100644
--- a/lib/asn1/lex.l
+++ b/lib/asn1/lex.l
@@ -11,10 +11,6 @@
 #include "symbol.h"
 #include "parse.h"
 
-#ifndef HAVE_STRDUP
-char *strdup(char *);
-#endif
-
 void error_message(char *, ...);
 
 static unsigned lineno = 1;
diff --git a/lib/asn1/parse.y b/lib/asn1/parse.y
index 19cb3cd94..b4b468c10 100644
--- a/lib/asn1/parse.y
+++ b/lib/asn1/parse.y
@@ -11,14 +11,12 @@
 #include "lex.h"
 #include "asn1_locl.h"
 
+RCSID("$Id$");
+
 static Type *new_type (Typetype t);
 void yyerror (char *);
 int yylex();
 
-#ifndef HAVE_STRDUP
-char *strdup(char *);
-#endif
-
 static void append (Member *l, Member *r);
 
 %}
@@ -170,6 +168,10 @@ static Type *
 new_type (Typetype tt)
 {
   Type *t = malloc(sizeof(*t));
+  if (t == NULL) {
+      error_message ("out of memory in malloc(%u)", sizeof(*t));
+      exit (1);
+  }
   t->type = tt;
   t->application = 0;
   t->members = NULL;