diff --git a/man2/mincore.2 b/man2/mincore.2
index fd213c2fc..973fff612 100644
--- a/man2/mincore.2
+++ b/man2/mincore.2
@@ -77,7 +77,7 @@ using
 The
 .I vec
 argument must point to an array containing at least
-.I "(length+PAGE_SIZE-1) / PAGE_SIZE"
+.I "(length+PAGE_SIZE\-1) / PAGE_SIZE"
 bytes.
 On return,
 the least significant bit of each byte will be set if