diff --git a/0001-Port-to-JFlex-1.7.0.patch b/0001-Port-to-JFlex-1.7.0.patch
new file mode 100644
index 0000000..441858b
--- /dev/null
+++ b/0001-Port-to-JFlex-1.7.0.patch
@@ -0,0 +1,39 @@
+From 31f530b26bd4625ffe41aa16c48836455ef81c23 Mon Sep 17 00:00:00 2001
+From: Mikolaj Izdebski <mizdebsk@redhat.com>
+Date: Fri, 7 Jun 2019 10:39:34 +0200
+Subject: [PATCH] Port to JFlex 1.7.0
+
+---
+ src/grammar/lexer.flex                                          | 2 +-
+ .../java/com/thoughtworks/qdox/library/ClassLoaderLibrary.java  | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/grammar/lexer.flex b/src/grammar/lexer.flex
+index 9b567ff..cd9d5b6 100644
+--- a/src/grammar/lexer.flex
++++ b/src/grammar/lexer.flex
+@@ -168,7 +168,7 @@ import java.util.*;
+   	}
+ 
+     public JFlexLexer( java.io.InputStream stream, java.io.Writer writer ) {
+-       this( stream );
++       this( new java.io.InputStreamReader( stream, java.nio.charset.Charset.forName( "UTF-8" ) ) );
+        this.writer = writer;
+   	}
+ 
+diff --git a/src/main/java/com/thoughtworks/qdox/library/ClassLoaderLibrary.java b/src/main/java/com/thoughtworks/qdox/library/ClassLoaderLibrary.java
+index c947f9b..5b415c0 100644
+--- a/src/main/java/com/thoughtworks/qdox/library/ClassLoaderLibrary.java
++++ b/src/main/java/com/thoughtworks/qdox/library/ClassLoaderLibrary.java
+@@ -112,7 +112,7 @@ public class ClassLoaderLibrary
+             if ( sourceStream != null )
+             {
+                 Builder builder = getModelBuilder();
+-                JavaLexer lexer = new JFlexLexer( sourceStream );
++                JavaLexer lexer = new JFlexLexer( new java.io.InputStreamReader( sourceStream, java.nio.charset.Charset.forName( "UTF-8" ) ) );
+                 Parser parser = new Parser( lexer, builder );
+                 parser.setDebugLexer( debugLexer );
+                 parser.setDebugParser( debugParser );
+-- 
+2.21.0
+
diff --git a/qdox.spec b/qdox.spec
index ad0f4d4..7b35e0a 100644
--- a/qdox.spec
+++ b/qdox.spec
@@ -14,6 +14,7 @@ Source1:        qdox-MANIFEST.MF
 # Remove bundled binaries which are possibly proprietary
 Source2:        generate-tarball.sh
 
+Patch0:         0001-Port-to-JFlex-1.7.0.patch
 
 BuildRequires:  maven-local
 BuildRequires:  mvn(org.apache.maven.plugins:maven-assembly-plugin)
@@ -40,6 +41,7 @@ API docs for %{name}.
 
 %prep
 %setup -q -n %{name}-%{version}-%{vertag}
+%patch0 -p1
 find -name *.jar -delete
 rm -rf bootstrap
 
@@ -54,10 +56,6 @@ rm -rf bootstrap
 
 %pom_xpath_set pom:workingDirectory '${basedir}/src/main/java/com/thoughtworks/qdox/parser/impl'
 
-# Compatibility with JFlex 1.7.0
-sed -i 's/JFlexLexer(\(.*\))/JFlexLexer(new java.io.InputStreamReader((\1), java.nio.charset.Charset.forName("UTF-8")))/' \
-    src/main/java/com/thoughtworks/qdox/library/ClassLoaderLibrary.java
-
 %build
 # Generate scanners (upstream does this with maven-jflex-plugin)
 jflex -d src/main/java/com/thoughtworks/qdox/parser/impl src/grammar/lexer.flex
@@ -80,7 +78,7 @@ jar ufm target/%{name}-%{version}*.jar %{SOURCE1}
 
 %changelog
 * Fri Jun 07 2019 Mikolaj Izdebski <mizdebsk@redhat.com> - 2.0-5.M9
-- Don't use deprecated inputstreamctor option
+- Port to JFlex 1.7.0
 
 * Fri May 24 2019 Mikolaj Izdebski <mizdebsk@redhat.com> - 2.0-4.M9
 - Mass rebuild for javapackages-tools 201901