diff --git a/en_US.ISO8859-1/articles/pgpkeys/Makefile b/en_US.ISO8859-1/articles/pgpkeys/Makefile
index 9518bcb61a..82ca72c57c 100644
--- a/en_US.ISO8859-1/articles/pgpkeys/Makefile
+++ b/en_US.ISO8859-1/articles/pgpkeys/Makefile
@@ -19,3 +19,7 @@ URL_RELPREFIX?=	../../../..
 DOC_PREFIX?=	${.CURDIR}/../../..
 
 .include "${DOC_PREFIX}/share/mk/doc.project.mk"
+
+# disable hyphenation of long lines in verbatim blocks
+# like <programlistings> to prevent PDF build errors
+XSLTPROCOPTS+=	--param hyphenate.verbatim 0