diff --git a/ref_vk/wscript b/ref_vk/wscript
index 0e67741e..22a35143 100644
--- a/ref_vk/wscript
+++ b/ref_vk/wscript
@@ -26,17 +26,18 @@ def configure(conf):
 	if not conf.env.VK:
 		return
 
-	conf.load('glslc')
-	conf.define('REF_DLL', 1)
-
 	if conf.env.DEST_OS == 'win32':
 		conf.start_msg('Vulkan SDK available?')
 		if not 'VULKAN_SDK' in conf.environ:
-			Logs.warn('VULKAN_SDK environment variable is not available, ref_vk will not be built')
+			conf.error('VULKAN_SDK environment variable is not available, ref_vk will not be built')
 			conf.end_msg('no')
 		conf.env.VULKAN_SDK = conf.environ['VULKAN_SDK']
 		conf.end_msg('found at ' + conf.env.VULKAN_SDK)
 
+	conf.load('glslc')
+
+	conf.define('REF_DLL', 1)
+
 	if conf.options.NSIGHT_AFTERMATH_SDK:
 		conf.start_msg('Nvidia Nsight Aftermath SDK')
 		conf.env.HAVE_AFTERMATH = 1
diff --git a/scripts/waifulib/glslc.py b/scripts/waifulib/glslc.py
index 70ec2b7c..b6ddcb5a 100644
--- a/scripts/waifulib/glslc.py
+++ b/scripts/waifulib/glslc.py
@@ -6,7 +6,11 @@ from waflib import *
 from waflib.Tools import c_preproc, ccroot
 
 def configure(conf):
-	conf.find_program('glslc')
+	if conf.env.DEST_OS == 'win32':
+		conf.find_program('glslc', path_list=[os.path.join(conf.env.VULKAN_SDK, 'Bin')])
+	else:
+		conf.find_program('glslc')
+
 
 	conf.add_os_flags('GLSLCPPFLAGS', dup=False)
 	conf.add_os_flags('GLSLCFLAGS', dup=False)