diff --git a/share/man/man7/build.7 b/share/man/man7/build.7
index 9adfd4bc8a6..785c73d3572 100644
--- a/share/man/man7/build.7
+++ b/share/man/man7/build.7
@@ -1154,7 +1154,7 @@ manpage first appeared in
 Old objects can cause obscure build problems; try
 .Ql make cleandir cleandir .
 .Pp
-Environment poisioning can cause obscure build problems; try prefixing
+Environment poisoning can cause obscure build problems; try prefixing
 .Xr make 1
 commands with
 .Ql env -i