diff --git a/build/org.eclipse.cdt.managedbuilder.gnu.ui/plugin.xml b/build/org.eclipse.cdt.managedbuilder.gnu.ui/plugin.xml
index 784e67955d3..0d8ca731a96 100644
--- a/build/org.eclipse.cdt.managedbuilder.gnu.ui/plugin.xml
+++ b/build/org.eclipse.cdt.managedbuilder.gnu.ui/plugin.xml
@@ -1036,21 +1036,16 @@
 			  id="gnu.c.compiler.option.preprocessor.preprocess"
 			  valueType="boolean">
 		  </option>
-		  <optionCategory
-			  owner="cdt.managedbuild.tool.gnu.c.compiler"
-			  name="%OptionCategory.Symbols"
-			  id="gnu.c.compiler.category.symbols">
-		  </optionCategory>
 		  <option
 			  name="%Option.Posix.DefSym"
-			  category="gnu.c.compiler.category.symbols"
+			  category="gnu.c.compiler.category.preprocessor"
 			  command="-D"
 			  id="gnu.c.compiler.option.preprocessor.def.symbols"
 			  valueType="definedSymbols">
 		  </option>
 		  <option
 			  name="%Option.Posix.UndefSym"
-			  category="gnu.c.compiler.category.symbols"
+			  category="gnu.c.compiler.category.preprocessor"
 			  command="-U"
 			  id="gnu.c.compiler.option.preprocessor.undef.symbol"
 			  valueType="undefDefinedSymbols">