diff --git a/xml2xslt.xsl b/xml2xslt.xsl
index 7eb54b2..358cf44 100644
--- a/xml2xslt.xsl
+++ b/xml2xslt.xsl
@@ -463,7 +463,7 @@
 							<xsl-out:text>
 \begin{document}
 </xsl-out:text>
-                            <xsl-out:if test="not(@suppress-latex-title) or (@suppress-latex-title != ('yes', 'y', 'true', 't', '1'))">
+                            <xsl-out:if test="not(@suppress-latex-title) or not(@suppress-latex-title = ('yes', 'y', 'true', 't', '1'))">
                                 <xsl-out:text>
 	\maketitle
 </xsl-out:text>
@@ -485,7 +485,7 @@
 							<!--
 								If you're having problems with the build date appearing in weird or annoying locations (usually because of floating items like tables and figures), set document/@auto-latex-build-date to "no". You can then use the build-date element to insert the build date wherever you like, if necessary. This really only applies to LaTeX documents. The behaviour of HTML documents is much more predictable because they don't have elements with "minds of their own", so the build date is guaranteed to always appear at the very end.
 							-->
-							<xsl-out:if test="not(@auto-latex-build-date) or (@auto-latex-build-date != ('no', 'n', 'false', 'f', '0'))">
+							<xsl-out:if test="not(@auto-latex-build-date) or not(@auto-latex-build-date = ('no', 'n', 'false', 'f', '0'))">
 							
 								<xsl-out:call-template name="build-date-internal">
 									<xsl-out:with-param name="format">long</xsl-out:with-param>
@@ -499,7 +499,7 @@
 						<xsl-out:otherwise>
 							<xsl-out:apply-templates select="title" mode="chapter" />
 							<xsl-out:apply-templates select="*[not(self::title)]" />
-							<xsl-out:if test="not(@auto-latex-build-date) or (@auto-latex-build-date != ('no', 'n', 'false', 'f', '0'))">
+							<xsl-out:if test="not(@auto-latex-build-date) or not(@auto-latex-build-date = ('no', 'n', 'false', 'f', '0'))">
 								<xsl-out:call-template name="build-date-internal">
 									<xsl-out:with-param name="format">long</xsl-out:with-param>
 									<xsl-out:with-param name="style">footer</xsl-out:with-param>