diff --git a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/core/Builder.java b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/core/Builder.java
index a1a2a8cd427..77657686058 100644
--- a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/core/Builder.java
+++ b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/core/Builder.java
@@ -2246,13 +2246,14 @@ public class Builder extends BuildObject implements IBuilder, IMatchKeyProvider
 
 	public void setParallelizationNum(int num) throws CoreException {
 //		if(num == 0 || supportsParallelBuild()){
-			parallelNum = new Integer(num);
+			Integer newParallelNum = new Integer(num);
 			String curCmd = getParallelizationCmd(getParallelizationNum());
 			String args = getArgumentsAttribute();
 			String updatedArgs = removeCmd(args, curCmd);
 			if(!updatedArgs.equals(args)){
 				setArgumentsAttribute(updatedArgs);
 			}
+			parallelNum = newParallelNum;
 			setDirty(true);
 //		}
 	}