diff --git a/bindings/java/build.xml b/bindings/java/build.xml
index c296dd01..7f467ac4 100644
--- a/bindings/java/build.xml
+++ b/bindings/java/build.xml
@@ -107,14 +107,18 @@
       <arg value="${build}/src"/>
     </exec>
 
+   <condition property="win32.jni" value="jni/win32">
+      <os family="windows"/>
+   </condition>
+
     <!-- include sigar *.c files rather than link against libsigar -->
     <patternset id="jni.source.files">
       <include name="src/*.c"/>
       <include name="src/os/${jni.src}/*.c"/>
       <include name="bindings/java/src/jni/*.c"/>
       <exclude name="bindings/java/src/jni/javasigar_generated.c"/>
-      <include name="bindings/java/src/jni/win32/*.cpp"/>
-      <include name="bindings/java/src/jni/win32/*.c"/>
+      <include name="bindings/java/src/${win32.jni}/*.cpp"/>
+      <include name="bindings/java/src/${win32.jni}/*.c"/>
     </patternset>
 
     <path id="jni.include.dirs">