diff --git a/libpng.3 b/libpng.3
index abe1b65b9..8bdbbd441 100644
--- a/libpng.3
+++ b/libpng.3
@@ -4229,7 +4229,7 @@ version 1.0.6j; from then on they were given the upcoming public
 release number plus "betaNN" or "rcN".
 
 .SH "SEE ALSO"
-.IR png(5) ", " libpngpf(3) ", " zlib(3) ", " deflate(5) ", and " zlib(5)
+.BR "png"(5), " libpngpf"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
 
 .LP
 .IR libpng :
diff --git a/libpngpf.3 b/libpngpf.3
index b1da388a9..d72b63ecd 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -805,6 +805,6 @@ are listed alphabetically here as an aid to libpng maintainers.
 See png.h for more information on these functions.
 
 .SH SEE ALSO
-.IR png(5) ", " libpng(3) ", " zlib(3) ", " deflate(5) ", and " zlib(5)
+.BR "png"(5), " libpng"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
 .SH AUTHOR
 Glenn Randers-Pehrson
diff --git a/png.5 b/png.5
index 40a40c1d7..4ac89cc90 100644
--- a/png.5
+++ b/png.5
@@ -18,7 +18,7 @@ gamma and chromaticity data for improved color matching on heterogeneous
 platforms.
 
 .SH "SEE ALSO"
-.IR libpng(3) ", "libpngpf(3) ", " zlib(3) ", " deflate(5) ", and " zlib(5)
+.BR "libpng"(3), " libpngpf"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
 .LP
 PNG specification (second edition), November 2003:
 .IP