diff --git a/lib/libproc/libproc.h b/lib/libproc/libproc.h
index 38a4faff94d..a77bdbb35b5 100644
--- a/lib/libproc/libproc.h
+++ b/lib/libproc/libproc.h
@@ -105,8 +105,6 @@ typedef enum {
 	REG_RVAL2
 } proc_reg_t;
 
-#define SIG2STR_MAX	8
-
 typedef struct lwpstatus {
 	int pr_why;
 #define PR_REQUESTED	1	/* not implemented */