diff --git a/x11/vulkan/vulkan/actions.py b/x11/vulkan/vulkan/actions.py
index 72cf10665e..6696f0fe0f 100755
--- a/x11/vulkan/vulkan/actions.py
+++ b/x11/vulkan/vulkan/actions.py
@@ -89,11 +89,11 @@ def setup():
 def build():
     shelltools.cd("%s/Vulkan-Loader-%s" %(get.workDIR(), ver))
     shelltools.cd("build")
-    cmaketools.make()
+    cmaketools.make("-j1")
     
     shelltools.cd("%s/Vulkan-ValidationLayers-%s" %(get.workDIR(), ver))
     shelltools.cd("build")
-    cmaketools.make()
+    cmaketools.make("-j1")
     
 def install():