diff --git a/man2/mprotect.2 b/man2/mprotect.2
index b1b3bd508..0cef9dc14 100644
--- a/man2/mprotect.2
+++ b/man2/mprotect.2
@@ -36,7 +36,7 @@ mprotect \- set protection on a region of memory
 .nf
 .B #include <sys/mman.h>
 .sp
-.BI "int mprotect(const void *" addr ", size_t " len ", int " prot );
+.BI "int mprotect(void *" addr ", size_t " len ", int " prot );
 .fi
 .SH DESCRIPTION
 .BR mprotect ()