diff --git a/nsprpub/pr/include/md/_hpux.h b/nsprpub/pr/include/md/_hpux.h
index 1cdad13e46e2..2675a97e6850 100644
--- a/nsprpub/pr/include/md/_hpux.h
+++ b/nsprpub/pr/include/md/_hpux.h
@@ -40,7 +40,9 @@
 #undef	HAVE_WEAK_MALLOC_SYMBOLS
 #define	HAVE_DLL
 #define USE_HPSHL
+#ifndef HAVE_STRERROR
 #define HAVE_STRERROR
+#endif
 
 #undef _PR_HAVE_ATOMIC_OPS