diff --git a/docs/npc.1 b/docs/npc.1
index daad9f1..f3b7d0c 100644
--- a/docs/npc.1
+++ b/docs/npc.1
@@ -21,9 +21,9 @@ Print normally non-printing characters.
 
 The program reads from standard input and writes to standard output, replacing
 non-printing characters with printable equivalents. Control characters print as
-a carat (“^”) followed by the character “@” through “_” corresponding to the
-character replaced (e.g. control-X becomes “^X”). The delete character (0x7F)
-becomes “^?”. Characters with the high bit set (>127) are printed as “M-”
+a carat ('^') followed by the character '@' through '_' corresponding to the
+character replaced (e.g. control-X becomes '^X'). The delete character (0x7F)
+becomes '^?'. Characters with the high bit set (>127) are printed as 'M-'
 followed by the graphical representation for the same character without the
 high bit set.
 
@@ -31,12 +31,12 @@ high bit set.
 
 .B -e
 .RS
-Prints a currency sign (“$”) before each line ending.
+Prints a currency sign ('$') before each line ending.
 .RE
 
 .B -t
 .RS
-Prints tab characters as “^I” rather than a literal horizontal tab.
+Prints tab characters as '^I' rather than a literal horizontal tab.
 .RE
 
 .SH DIAGNOSTICS