diff --git a/AMBuildScript b/AMBuildScript
index b567f62..859441f 100644
--- a/AMBuildScript
+++ b/AMBuildScript
@@ -302,7 +302,7 @@ class MMSConfig(object):
       defines += ['SE_{}={}'.format(other_sdk['define'], other_sdk['code'])]
 
     compiler.defines += defines
-    compiler.defines += ['SOURCE_ENGINE=' + sdk['code']]
+    compiler.defines += ['SOURCE_ENGINE={}'.format(sdk['code'])]
 
     if sdk['name'] in ['sdk2013', 'bms', 'pvkii'] and compiler.like('gcc'):
       # The 2013 SDK already has these in public/tier0/basetypes.h
diff --git a/hl2sdk-manifests b/hl2sdk-manifests
index 4b11e3a..d771d65 160000
--- a/hl2sdk-manifests
+++ b/hl2sdk-manifests
@@ -1 +1 @@
-Subproject commit 4b11e3a40c2bd01aeaf85baab816c3c8fefede85
+Subproject commit d771d65b44596b18dbb484dd868708ee5b1a7705