diff --git a/Source/cmExtraEclipseCDT4Generator.cxx b/Source/cmExtraEclipseCDT4Generator.cxx
index fe914fd23..204d5d7f0 100644
--- a/Source/cmExtraEclipseCDT4Generator.cxx
+++ b/Source/cmExtraEclipseCDT4Generator.cxx
@@ -292,7 +292,6 @@ void cmExtraEclipseCDT4Generator::CreateProjectFile()
     AddEnvVar(fout, "INCLUDE", mf);
     AddEnvVar(fout, "LIB", mf);
     AddEnvVar(fout, "LIBPATH", mf);
-    AddEnvVar(fout, "INCLUDE", mf);
     }
   else if (compilerId == "Intel")
     {