diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2
index 72afafb50..eb7ab29ea 100644
--- a/man2/perf_event_open.2
+++ b/man2/perf_event_open.2
@@ -560,10 +560,13 @@ To calculate the appropriate
 value use the following equation:
 .PP
 .RS 4
-.nf
-    (perf_hw_cache_id) | (perf_hw_cache_op_id << 8) |
-    (perf_hw_cache_op_result_id << 16)
-.fi
+.RS 4
+.EX
+config = (perf_hw_cache_id) |
+         (perf_hw_cache_op_id << 8) |
+         (perf_hw_cache_op_result_id << 16);
+.EE
+.RE
 .PP
 where
 .I perf_hw_cache_id