diff --git a/sys-devel/flex/flex-2.5.39.recipe b/sys-devel/flex/flex-2.5.39.recipe
index 81b9dd684..2a5389ce3 100644
--- a/sys-devel/flex/flex-2.5.39.recipe
+++ b/sys-devel/flex/flex-2.5.39.recipe
@@ -49,7 +49,7 @@ BUILD()
 	runConfigure ./configure \
 		--disable-rpath --with-gnu-ld --disable-shared \
 		--disable-dependency-tracking --disable-nls
-	make $jobArgs
+	make # Unreliable parallel builds
 }
 
 INSTALL()