diff --git a/man3/stdio.3 b/man3/stdio.3
index 0c773e989..9a478dfb0 100644
--- a/man3/stdio.3
+++ b/man3/stdio.3
@@ -113,7 +113,7 @@ and
 .IR stderr .
 When opened, the standard error stream is not fully buffered; the standard
 input and output streams are fully buffered if and only if the streams do
-not to refer to an interactive device.
+not refer to an interactive device.
 .PP
 Output streams that refer to terminal devices are always line buffered by
 default; pending output to such streams is written automatically whenever