diff --git a/build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/ui/preferences/PropertyPageDefsTab.java b/build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/ui/preferences/PropertyPageDefsTab.java
index 5aa823e6009..6b15754c650 100644
--- a/build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/ui/preferences/PropertyPageDefsTab.java
+++ b/build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/ui/preferences/PropertyPageDefsTab.java
@@ -87,7 +87,7 @@ public class PropertyPageDefsTab extends AbstractCPropertyTab {
 	//	show_mul.setSelection(CDTPrefUtil.getBool(CDTPrefUtil.KEY_MULTI));
 		show_mng.setSelection(!CDTPrefUtil.getBool(CDTPrefUtil.KEY_NOMNG));
 		show_sav.setSelection(!CDTPrefUtil.getBool(CDTPrefUtil.KEY_NOSAVE));
-		show_tool.setSelection(CDTPrefUtil.getBool(CDTPrefUtil.KEY_TOOLM));
+		show_tool.setSelection(!CDTPrefUtil.getBool(CDTPrefUtil.KEY_NOTOOLM));
 		show_exp.setSelection(CDTPrefUtil.getBool(CDTPrefUtil.KEY_EXPORT));
 		
 		switch (CDTPrefUtil.getInt(CDTPrefUtil.KEY_DISC_NAMES)) {
@@ -103,7 +103,7 @@ public class PropertyPageDefsTab extends AbstractCPropertyTab {
 	//	CDTPrefUtil.setBool(CDTPrefUtil.KEY_MULTI, show_mul.getSelection());
 		CDTPrefUtil.setBool(CDTPrefUtil.KEY_NOMNG, !show_mng.getSelection());
 		CDTPrefUtil.setBool(CDTPrefUtil.KEY_NOSAVE, !show_sav.getSelection());
-		CDTPrefUtil.setBool(CDTPrefUtil.KEY_TOOLM, show_tool.getSelection());
+		CDTPrefUtil.setBool(CDTPrefUtil.KEY_NOTOOLM, !show_tool.getSelection());
 		CDTPrefUtil.setBool(CDTPrefUtil.KEY_EXPORT, show_exp.getSelection());
 		int x = 0;
 		if (b_1.getSelection()) x = 1;
diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/CDTPrefUtil.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/CDTPrefUtil.java
index c59a65f3893..4330eb9d2d6 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/CDTPrefUtil.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/CDTPrefUtil.java
@@ -26,7 +26,7 @@ public class CDTPrefUtil {
 	public static final String KEY_MULTI   = "properties.multi.config.enable"; //$NON-NLS-1$
 	public static final String KEY_DTREE   = "properties.data.hierarchy.enable"; //$NON-NLS-1$
 	public static final String KEY_NOSAVE  = "properties.save.position.disable"; //$NON-NLS-1$
-	public static final String KEY_TOOLM   = "properties.toolchain.modification.enable"; //$NON-NLS-1$
+	public static final String KEY_NOTOOLM   = "properties.toolchain.modification.disable"; //$NON-NLS-1$
 	public static final String KEY_EXPORT  = "properties.export.page.enable"; //$NON-NLS-1$
 	// string keys
 	public static final String KEY_PREFTC  = "wizard.preferred.toolchains";  //$NON-NLS-1$
diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/PropertyTester.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/PropertyTester.java
index 34b9b350f59..fc23b73f8e0 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/PropertyTester.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/PropertyTester.java
@@ -40,7 +40,7 @@ public class PropertyTester extends org.eclipse.core.expressions.PropertyTester
 			if (VAL_EXP.equalsIgnoreCase(s))
 				return CDTPrefUtil.getBool(CDTPrefUtil.KEY_EXPORT);
 			if (VAL_TOOL.equalsIgnoreCase(s))
-				return CDTPrefUtil.getBool(CDTPrefUtil.KEY_TOOLM);
+				return !CDTPrefUtil.getBool(CDTPrefUtil.KEY_NOTOOLM);
 		}
 		return false;
 	}