diff --git a/AMBuildScript b/AMBuildScript
index a2081bc..8e84de6 100644
--- a/AMBuildScript
+++ b/AMBuildScript
@@ -177,10 +177,10 @@ class MMSConfig(object):
       if cxx.family == 'gcc':
         cxx.cflags += ['-mfpmath=sse']
       if cxx.family == 'clang':
-        if cfg.version >= 'clang-3.6':
+        if cxx.version >= 'clang-3.6':
           cxx.cxxflags += ['-Wno-inconsistent-missing-override']
           cxx.cxxflags += ['-Wno-implicit-exception-spec-mismatch']
-        if cxx.version >= 'apple-clang-5.1' or cfg.version >= 'clang-3.4':
+        if cxx.version >= 'apple-clang-5.1' or cxx.version >= 'clang-3.4':
           cxx.cxxflags += ['-Wno-deprecated-register']
         else:
           cxx.cxxflags += ['-Wno-deprecated']
@@ -473,4 +473,4 @@ if builder.backend == 'amb2':
 builder.Build(BuildScripts, { 'MMS': MMS })
 
 if builder.options.breakpad_dump:
-    builder.Build('support/buildbot/BreakpadSymbols', { 'MMS': MMS })
\ No newline at end of file
+    builder.Build('support/buildbot/BreakpadSymbols', { 'MMS': MMS })