diff --git a/extras/Projucer/Source/Project Saving/jucer_ProjectSaver.h b/extras/Projucer/Source/Project Saving/jucer_ProjectSaver.h
index e5f5f4493f..3091dfb0e8 100644
--- a/extras/Projucer/Source/Project Saving/jucer_ProjectSaver.h	
+++ b/extras/Projucer/Source/Project Saving/jucer_ProjectSaver.h	
@@ -454,7 +454,7 @@ private:
                     else if (value == Project::configFlagDisabled)
                         out << " #define   " << f->symbol << " 0";
                     else if (f->defaultValue.isEmpty())
-                        out << " //#define " << f->symbol;
+                        out << " //#define " << f->symbol << " 1";
                     else
                         out << " #define " << f->symbol << " " << f->defaultValue;