diff --git a/server_extensions_api/build.xml b/server_extensions_api/build.xml
index b0302d3..37b9159 100644
--- a/server_extensions_api/build.xml
+++ b/server_extensions_api/build.xml
@@ -38,7 +38,7 @@
     </path>
 
     <target name="compile" depends="init" description="compile the source ">
-        <javac srcdir="${src}" destdir="${build}" debug="true" debuglevel="lines,vars,source" includeantruntime="false">
+        <javac source="1.7" target="1.7" srcdir="${src}" destdir="${build}" debug="true" debuglevel="lines,vars,source" includeantruntime="false">
             <classpath>
                 <path refid="classpath"/>
             </classpath>
@@ -54,4 +54,4 @@
         <delete dir="${build}"/>
         <delete dir="${dist}"/>
     </target>
-</project>
\ No newline at end of file
+</project>
diff --git a/server_extensions_extra/build.xml b/server_extensions_extra/build.xml
index 8f92416..69ebbf8 100644
--- a/server_extensions_extra/build.xml
+++ b/server_extensions_extra/build.xml
@@ -41,7 +41,7 @@
     </path>
 
     <target name="compile" depends="init" description="compile the source ">
-        <javac srcdir="${src}" destdir="${build}" debug="true" debuglevel="lines,vars,source" includeantruntime="false">
+        <javac source="1.7" target="1.7" srcdir="${src}" destdir="${build}" debug="true" debuglevel="lines,vars,source" includeantruntime="false">
             <classpath>
                 <path refid="classpath"/>
             </classpath>
@@ -62,4 +62,4 @@
         <delete dir="${build}"/>
         <delete dir="${dist}"/>
     </target>
-</project>
\ No newline at end of file
+</project>
diff --git a/server_extensions_test/build.xml b/server_extensions_test/build.xml
index 6529ea2..f6db115 100644
--- a/server_extensions_test/build.xml
+++ b/server_extensions_test/build.xml
@@ -43,7 +43,7 @@
     </path>
 
     <target name="compile" depends="init" description="compile the source ">
-        <javac srcdir="${src}" destdir="${build}" debug="true" debuglevel="lines,vars,source" includeantruntime="false">
+        <javac source="1.7" target="1.7" srcdir="${src}" destdir="${build}" debug="true" debuglevel="lines,vars,source" includeantruntime="false">
             <classpath>
                 <path refid="classpath"/>
             </classpath>
@@ -63,4 +63,4 @@
         <delete dir="${build}"/>
         <delete dir="${dist}"/>
     </target>
-</project>
\ No newline at end of file
+</project>