diff --git a/Source/cmDependsJava.cxx b/Source/cmDependsJava.cxx
index ebd1d83d27..0d121f90d1 100644
--- a/Source/cmDependsJava.cxx
+++ b/Source/cmDependsJava.cxx
@@ -40,7 +40,7 @@ cmDependsJava::~cmDependsJava()
 }
 
 //----------------------------------------------------------------------------
-bool cmDependsJava::WriteDependencies(std::ostream& os)
+bool cmDependsJava::WriteDependencies(std::ostream&)
 {
   // Make sure this is a scanning instance.
   if(m_SourceFile == "")