diff --git a/pika-build-config/i386setup.sh b/pika-build-config/i386setup.sh
index a10245be2..af05c8b69 100755
--- a/pika-build-config/i386setup.sh
+++ b/pika-build-config/i386setup.sh
@@ -4,9 +4,9 @@ export PIKA_BUILD_ARCH="i386"
 export PIKA_PBUILDER_INIT="pika-pbuilder-i386-init"
 export PIKA_PBUILDER_BUILD="pika-pbuilder-i386-build"
 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_BUILD_MAINT_OPTIONS="-Wno-incompatible-pointer-types -w -DQT_NO_VERSION_TAGGING -DCMake_HAVE_CXX_MAKE_UNIQUE=0 -DCMake_HAVE_CXX_FILESYSTEM=0"
+export DEB_CFLAGS_MAINT_APPEND="-Wno-incompatible-pointer-types -w -DQT_NO_VERSION_TAGGING -DCMake_HAVE_CXX_MAKE_UNIQUE=0 -DCMake_HAVE_CXX_FILESYSTEM=0"
+export DEB_CPPFLAGS_MAINT_APPEND="-Wno-incompatible-pointer-types -w -DQT_NO_VERSION_TAGGING -DCMake_HAVE_CXX_MAKE_UNIQUE=0 -DCMake_HAVE_CXX_FILESYSTEM=0"
 export DEB_CXXFLAGS_MAINT_APPEND="-Wno-incompatible-pointer-types -w -DQT_NO_VERSION_TAGGING -DCMake_HAVE_CXX_MAKE_UNIQUE=0 -DCMake_HAVE_CXX_FILESYSTEM=0"
 export DEB_LDFLAGS_MAINT_APPEND="-Wno-incompatible-pointer-types -w -DQT_NO_VERSION_TAGGING"
 export DEB_BUILD_OPTIONS="nocheck notest terse"