diff --git a/configure.ac b/configure.ac
index fbdcc17e..9c1a589f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -53,7 +53,7 @@ AC_CHECK_HEADER([shadow.h],,[AC_MSG_ERROR([You need a libc with shadow.h])])
 
 AC_CHECK_FUNCS(arc4random_buf l64a fchmod fchown fsync futimes getgroups \
 	gethostname getentropy getrandom getspnam gettimeofday getusershell \
-	getutent initgroups lchown lckpwdf lstat lutimes memset \
+	getutent initgroups lchown lckpwdf lstat lutimes \
 	setgroups sigaction strchr updwtmp updwtmpx innetgr getpwnam_r \
 	getpwuid_r getgrnam_r getgrgid_r getspnam_r getaddrinfo ruserok \
 	dlopen)
diff --git a/lib/defines.h b/lib/defines.h
index 5153f43c..fc1521cb 100644
--- a/lib/defines.h
+++ b/lib/defines.h
@@ -111,11 +111,7 @@ char *strchr (), *strrchr (), *strtok ();
 # endif
 #endif				/* not TIME_WITH_SYS_TIME */
 
-#ifdef HAVE_MEMSET
-# define memzero(ptr, size) memset((void *)(ptr), 0, (size))
-#else
-# define memzero(ptr, size) bzero((char *)(ptr), (size))
-#endif
+#define memzero(ptr, size) memset((void *)(ptr), 0, (size))
 #define strzero(s) memzero(s, strlen(s))	/* warning: evaluates twice */
 
 #ifdef HAVE_DIRENT_H		/* DIR_SYSV */