diff --git a/mkspecs/features/mac/sdk.prf b/mkspecs/features/mac/sdk.prf
index 4c3e2d2b5a..320e4e5382 100644
--- a/mkspecs/features/mac/sdk.prf
+++ b/mkspecs/features/mac/sdk.prf
@@ -24,6 +24,7 @@
 
     # We use xml as the output format instead of json since plutil on 10.6 does not have that option
     QMAKE_MAC_PLATFORM_NAME = $$system("plutil -convert xml1 \"$$QMAKE_MAC_SDK_PATH/SDKSettings.plist\" -o - | " \
+        "sed '/^<!DOCTYPE/d' | " \ # Don't look up http://www.apple.com/DTDs/PropertyList-1.0.dtd
         "PERL5LIB= xpath 'string(//key[.=\"PLATFORM_NAME\"]/following-sibling::*[1])' 2>&1 | " \
         "sed 's/.*Value: \\(.*\\)/\\1/'")