diff --git a/lib/libc/stdlib/malloc.c b/lib/libc/stdlib/malloc.c
index 5bfa4ee2eac..2b8d8077fb4 100644
--- a/lib/libc/stdlib/malloc.c
+++ b/lib/libc/stdlib/malloc.c
@@ -57,6 +57,10 @@
 #       define malloc_pageshift		13U
 #       define malloc_minsize		16U
 #   endif
+#   if defined(__sparc64__)
+#       define malloc_pageshift		13U
+#       define malloc_minsize		16U
+#   endif
 #   if !defined(__NETBSD_SYSCALLS)
 #       define HAS_UTRACE
 #   endif
diff --git a/lib/libc/stdlib/strtod.c b/lib/libc/stdlib/strtod.c
index e18a8526539..0af493272e5 100644
--- a/lib/libc/stdlib/strtod.c
+++ b/lib/libc/stdlib/strtod.c
@@ -119,7 +119,8 @@ static char sccsid[] = "@(#)strtod.c	8.1 (Berkeley) 6/4/93";
  *	FLT_RADIX, FLT_ROUNDS, and DBL_MAX.
  */
 
-#if defined(__i386__) || defined(__ia64__) || defined(__alpha__)
+#if defined(__i386__) || defined(__ia64__) || defined(__alpha__) || \
+    defined(__sparc64__)
 #include <sys/types.h>
 #if BYTE_ORDER == BIG_ENDIAN
 #define IEEE_BIG_ENDIAN
diff --git a/lib/libc/xdr/xdr_float.c b/lib/libc/xdr/xdr_float.c
index 024888f834a..0e5e9887dc1 100644
--- a/lib/libc/xdr/xdr_float.c
+++ b/lib/libc/xdr/xdr_float.c
@@ -64,7 +64,7 @@ static char *rcsid = "$FreeBSD$";
 #if defined(__m68k__) || defined(__sparc__) || defined(__i386__) || \
     defined(__mips__) || defined(__ns32k__) || defined(__alpha__) || \
     defined(__arm32__) || defined(__ppc__) || defined(__ia64__) || \
-    defined(__arm26__)
+    defined(__arm26__) || defined(__sparc64__)
 #include <machine/endian.h>
 #define IEEEFP
 #endif