diff --git a/include/libbb.h b/include/libbb.h
index 1294fb75d..f0b248b4c 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -224,7 +224,7 @@ extern int sysinfo(struct sysinfo* info);
 
 
 /* Size-saving "small" ints (arch-dependent) */
-#if defined(i386) || defined (__mips__)
+#if defined(i386) || defined(__x86_64__) || defined(__mips__)
 /* add other arches which benefit from this... */
 typedef signed char smallint;
 typedef unsigned char smalluint;