diff --git a/build/org.eclipse.cdt.make.core/src/org/eclipse/cdt/make/internal/core/BuildInfoFactory.java b/build/org.eclipse.cdt.make.core/src/org/eclipse/cdt/make/internal/core/BuildInfoFactory.java
index fe1ae0b512b..a645f36415e 100644
--- a/build/org.eclipse.cdt.make.core/src/org/eclipse/cdt/make/internal/core/BuildInfoFactory.java
+++ b/build/org.eclipse.cdt.make.core/src/org/eclipse/cdt/make/internal/core/BuildInfoFactory.java
@@ -333,6 +333,7 @@ public class BuildInfoFactory {
 			ICommand builder = MakeProjectNature.getBuildSpec(description, builderID);
 			args.put(name, value);
 			builder.setArguments(args);
+			MakeProjectNature.setBuildSpec(description, builder);
 			project.setDescription(description, null);
 		}