diff --git a/man2/mbind.2 b/man2/mbind.2
index 2a690e6c0..6cff10a35 100644
--- a/man2/mbind.2
+++ b/man2/mbind.2
@@ -49,9 +49,9 @@ mbind \- set memory policy for a memory range
 .nf
 .B "#include <numaif.h>"
 .sp
-.BI "int mbind(void *" addr ", unsigned long " len  ", int " mode ,
-.BI "          unsigned long *" nodemask  ", unsigned long " maxnode ,
-.BI "          unsigned " flags );
+.BI "long mbind(void *" addr ", unsigned long " len  ", int " mode ,
+.BI "           const unsigned long *" nodemask  ", unsigned long " maxnode ,
+.BI "           unsigned " flags );
 .sp
 Link with \fI\-lnuma\fP.
 .fi