diff --git a/usr.bin/systat/convtbl.c b/usr.bin/systat/convtbl.c
index 79005ce73977..0e16de64cf59 100644
--- a/usr.bin/systat/convtbl.c
+++ b/usr.bin/systat/convtbl.c
@@ -33,7 +33,23 @@
 #include <string.h>
 #include "convtbl.h"
 
-struct	convtbl convtbl[] = {
+#define BIT	(8)
+#define BYTE	(1)
+
+#define BITS	(1)
+#define BYTES	(1)
+#define KILO	(1024LL)
+#define MEGA	(KILO * 1024)
+#define GIGA	(MEGA * 1024)
+
+struct convtbl {
+	uintmax_t	 mul;
+	uintmax_t	 scale;
+	const char	*str;
+	const char	*name;
+};
+
+static struct convtbl convtbl[] = {
 	/* mul, scale, str, name */
 	[SC_BYTE] =	{ BYTE, BYTES, "B",  "byte"  },
 	[SC_KILOBYTE] =	{ BYTE, KILO,  "KB", "kbyte" },
diff --git a/usr.bin/systat/convtbl.h b/usr.bin/systat/convtbl.h
index 87a6c0905372..c3daa0f5b647 100644
--- a/usr.bin/systat/convtbl.h
+++ b/usr.bin/systat/convtbl.h
@@ -34,12 +34,6 @@
 #include <sys/types.h>
 #include <stdint.h>
 
-#define BITS	(1)
-#define BYTES	(1)
-#define KILO	(1024LL)
-#define	MEGA	(KILO * 1024)
-#define GIGA	(MEGA * 1024)
-
 enum scale {
 	SC_BYTE,
 	SC_KILOBYTE,
@@ -52,18 +46,6 @@ enum scale {
 	SC_AUTO		/* KEEP THIS LAST */
 };
 
-#define BIT	(8)
-#define BYTE	(1)
-
-struct convtbl {
-	uintmax_t	 mul;
-	uintmax_t	 scale;
-	const char	*str;
-	const char	*name;
-};
-
-extern	struct convtbl convtbl[];
-
 extern	double		 convert(const uintmax_t, const int);
 extern	const char	*get_helplist(void);
 extern	int		 get_scale(const char *);