diff --git a/Source/cmTarget.cxx b/Source/cmTarget.cxx
index 639891255..48811c82c 100644
--- a/Source/cmTarget.cxx
+++ b/Source/cmTarget.cxx
@@ -903,7 +903,7 @@ void cmTarget::DefineProperties(cmake *cm)
      "Build an executable with a WinMain entry point on windows.",
      "When this property is set to true the executable when linked "
      "on Windows will be created with a WinMain() entry point instead "
-     "of of just main().  "
+     "of just main().  "
      "This makes it a GUI executable instead of a console application.  "
      "See the CMAKE_MFC_FLAG variable documentation to configure use "
      "of MFC for WinMain executables.  "