diff --git a/src/docs/asciidoc/appendix.adoc b/src/docs/asciidoc/appendix.adoc
index cb02ef7a94..4d661e561d 100644
--- a/src/docs/asciidoc/appendix.adoc
+++ b/src/docs/asciidoc/appendix.adoc
@@ -5,7 +5,6 @@
 :wiki-spring-framework: https://github.com/spring-projects/spring-framework/wiki
 :toc: left
 :toclevels: 2
-ifdef::backend-pdf[:source-highlighter: rouge]
 
 [[spring-whats-new]]
 == What's New in the Spring Framework
diff --git a/src/docs/asciidoc/core.adoc b/src/docs/asciidoc/core.adoc
index 9f1e1a9138..79d2640383 100644
--- a/src/docs/asciidoc/core.adoc
+++ b/src/docs/asciidoc/core.adoc
@@ -4,7 +4,6 @@
 :api-spring-framework: {doc-root}/spring-framework/docs/{spring-version}/javadoc-api/org/springframework
 :toc: left
 :toclevels: 2
-ifdef::backend-pdf[:source-highlighter: rouge]
 
 This part of the reference documentation covers all of those technologies that are
 absolutely integral to the Spring Framework.
diff --git a/src/docs/asciidoc/data-access.adoc b/src/docs/asciidoc/data-access.adoc
index 5a37c77ea9..5fe41d0f33 100644
--- a/src/docs/asciidoc/data-access.adoc
+++ b/src/docs/asciidoc/data-access.adoc
@@ -4,7 +4,6 @@
 :api-spring-framework: {doc-root}/spring-framework/docs/{spring-version}/javadoc-api/org/springframework
 :toc: left
 :toclevels: 2
-ifdef::backend-pdf[:source-highlighter: rouge]
 
 This part of the reference documentation is concerned with data access and the
 interaction between the data access layer and the business or service layer.
diff --git a/src/docs/asciidoc/integration.adoc b/src/docs/asciidoc/integration.adoc
index 358726b944..d68e6b7e89 100644
--- a/src/docs/asciidoc/integration.adoc
+++ b/src/docs/asciidoc/integration.adoc
@@ -6,7 +6,6 @@
 :doc-spring-gemfire: {doc-root}/spring-gemfire/docs/current/reference
 :toc: left
 :toclevels: 2
-ifdef::backend-pdf[:source-highlighter: rouge]
 
 This part of the reference documentation covers the Spring Framework's integration with
 a number of Java EE (and related) technologies.
diff --git a/src/docs/asciidoc/overview.adoc b/src/docs/asciidoc/overview.adoc
index 2bb688c9c5..e66fb4864d 100644
--- a/src/docs/asciidoc/overview.adoc
+++ b/src/docs/asciidoc/overview.adoc
@@ -4,7 +4,6 @@
 :api-spring-framework: {doc-root}/spring-framework/docs/{spring-version}/javadoc-api/org/springframework
 :toc: left
 :toclevels: 2
-ifdef::backend-pdf[:source-highlighter: rouge]
 
 
 
diff --git a/src/docs/asciidoc/testing.adoc b/src/docs/asciidoc/testing.adoc
index 3ca4c513f7..041b79767d 100644
--- a/src/docs/asciidoc/testing.adoc
+++ b/src/docs/asciidoc/testing.adoc
@@ -5,7 +5,6 @@
 :doc-spring-boot: {doc-root}/spring-boot/docs/current/reference
 :toc: left
 :toclevels: 2
-ifdef::backend-pdf[:source-highlighter: rouge]
 
 The adoption of the test-driven-development (TDD) approach to software
 development is certainly advocated by the Spring team, and so coverage of Spring's
diff --git a/src/docs/asciidoc/web.adoc b/src/docs/asciidoc/web.adoc
index 136610c6be..e39f686261 100644
--- a/src/docs/asciidoc/web.adoc
+++ b/src/docs/asciidoc/web.adoc
@@ -4,7 +4,6 @@
 :api-spring-framework: {doc-root}/spring-framework/docs/{spring-version}/javadoc-api/org/springframework
 :toc: left
 :toclevels: 2
-ifdef::backend-pdf[:source-highlighter: rouge]
 
 This part of the reference documentation covers Spring Framework's support for the
 presentation tier (and specifically web-based presentation tiers) including support