diff --git a/pika-build-config/i386setup.sh b/pika-build-config/i386setup.sh
index 984e11343..90637dc0b 100755
--- a/pika-build-config/i386setup.sh
+++ b/pika-build-config/i386setup.sh
@@ -7,7 +7,7 @@ export DEBIAN_FRONTEND="noninteractive"
 export DEB_BUILD_MAINT_OPTIONS="-Wno-incompatible-pointer-types -w -DQT_NO_VERSION_TAGGING"
 export DEB_CFLAGS_MAINT_APPEND="-Wno-incompatible-pointer-types -w -DQT_NO_VERSION_TAGGING"
 export DEB_CPPFLAGS_MAINT_APPEND="-Wno-incompatible-pointer-types -w -DQT_NO_VERSION_TAGGING"
-export DEB_CXXFLAGS_MAINT_APPEND="-Wno-incompatible-pointer-types -w -DQT_NO_VERSION_TAGGING"
+export DEB_CXXFLAGS_MAINT_APPEND="-Wno-incompatible-pointer-types -w -DQT_NO_VERSION_TAGGING -DCMake_HAVE_CXX_MAKE_UNIQUE=1 -DCMake_HAVE_CXX_FILESYSTEM=1"
 export DEB_LDFLAGS_MAINT_APPEND="-Wno-incompatible-pointer-types -w -DQT_NO_VERSION_TAGGING"
 export DEB_BUILD_OPTIONS="nocheck notest terse"
 export DPKG_GENSYMBOLS_CHECK_LEVEL=0