diff --git a/man4/rtc.4 b/man4/rtc.4
index c4675a7dc..218582cca 100644
--- a/man4/rtc.4
+++ b/man4/rtc.4
@@ -238,9 +238,9 @@ these operations can be used to read or to set the RTC's Epoch,
 respectively.
 The third
 .BR ioctl (2)
-argument is a
+argument is an
 .I "unsigned long\ *"
-or a
+or an
 .IR "unsigned long" ,
 respectively, and the value returned (or assigned) is the Epoch.
 To set the RTC's Epoch the process must be privileged (i.e., have the