diff --git a/jdom2.spec b/jdom2.spec
index c9fa8ad..20586cd 100644
--- a/jdom2.spec
+++ b/jdom2.spec
@@ -64,8 +64,8 @@ find . -name "*.class" -print -delete
 find . -name "*.jar" -print -delete
 
 %patch0 -p0
-sed -i "s|%{_javadir}/objectweb-asm|%{_javadir}/objectweb-asm3|" build.xml
-sed -i "s|log4j.jar|log4j12-12.jar|" build.xml
+sed -i.asm "s|%{_javadir}/objectweb-asm|%{_javadir}/objectweb-asm3|" build.xml
+sed -i.log4j "s|log4j.jar|log4j12-12.jar|" build.xml
 %patch1 -p1
 
 cp -p %{SOURCE1} maven/contrib.pom
@@ -75,6 +75,7 @@ sed -i 's/\r//' LICENSE.txt README.txt
 
 %build
 
+export CLASSPATH=$(build-classpath log4j12-12)
 ant -Dversion=%{version} -Dj2se.apidoc=%{_javadocdir}/java maven
 
 %install