diff --git a/mkspecs/features/qt_build_extra.prf b/mkspecs/features/qt_build_extra.prf
index 4b01c7b285f..a346525e660 100644
--- a/mkspecs/features/qt_build_extra.prf
+++ b/mkspecs/features/qt_build_extra.prf
@@ -11,6 +11,10 @@
 
 equals(TEMPLATE, subdirs): return()
 
+# It's likely that these extra flags will be wrong for host builds,
+# and the bootstrapped tools usually don't need them anyway.
+host_build:force_bootstrap: return()
+
 # The headersclean check needs defines and includes even for
 # header-only modules.
 DEFINES += $$EXTRA_DEFINES