diff --git a/Makefile b/Makefile
index 9fd7f3f9bf..6ccb8639b0 100644
--- a/Makefile
+++ b/Makefile
@@ -727,9 +727,11 @@ else
 BLOBS=
 endif
 
+# Note that we manually filter-out the non-Sphinx documentation which
+# is currently built into the docs/interop directory in the build tree.
 define install-manual =
 for d in $$(cd $(MANUAL_BUILDDIR) && find $1 -type d); do $(INSTALL_DIR) "$(DESTDIR)$(qemu_docdir)/$$d"; done
-for f in $$(cd $(MANUAL_BUILDDIR) && find $1 -type f); do $(INSTALL_DATA) "$(MANUAL_BUILDDIR)/$$f" "$(DESTDIR)$(qemu_docdir)/$$f"; done
+for f in $$(cd $(MANUAL_BUILDDIR) && find $1 -type f -a '!' '(' -name 'qemu-*-qapi.*' -o -name 'qemu-*-ref.*' ')' ); do $(INSTALL_DATA) "$(MANUAL_BUILDDIR)/$$f" "$(DESTDIR)$(qemu_docdir)/$$f"; done
 endef
 
 # Note that we deliberately do not install the "devel" manual: it is