diff --git a/build/org.eclipse.cdt.make.core/build.properties b/build/org.eclipse.cdt.make.core/build.properties
index 16ca4e13de6..7a00e9ea7d4 100644
--- a/build/org.eclipse.cdt.make.core/build.properties
+++ b/build/org.eclipse.cdt.make.core/build.properties
@@ -3,5 +3,7 @@ bin.includes = plugin.xml,\
                cdtmakecore.jar,\
                *.html,\
                plugin.properties,\
-               schema/
+               schema/,\
+               builtin/
 source.cdtmakecore.jar = src/
+src.includes = builtin/