diff --git a/Makefile b/Makefile
index 4edd338..6f17118 100644
--- a/Makefile
+++ b/Makefile
@@ -185,7 +185,7 @@ install-%:
 	$(if $(filter yes,$($(PROJECT).install)),\
 		$(OCAMLFIND) install -add ctypes -optional $^ \
                    $(LIB_TARGETS) $(LIB_TARGET_EXTRAS) \
-                   $(INSTALL_MLIS) $(INSTALL_CMIS) \
+                   $(INSTALL_MLS) $(INSTALL_MLIS) $(INSTALL_CMIS) \
                    $(INSTALL_CMTS) $(INSTALL_CMTIS) \
                    $(INSTALL_HEADERS) \
                    $(if $(filter yes,$($(PROJECT).install_native_objects)),$(NATIVE_OBJECTS)))
diff --git a/Makefile.rules b/Makefile.rules
index 175bc06..3ec8672 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -81,6 +81,7 @@ INSTALL_CMIS = $($(PROJECT).public:%=$(BUILDDIR)/$($(PROJECT).dir)/%.cmi) \
 INSTALL_CMTIS = $($(PROJECT).public:%=$(BUILDDIR)/$($(PROJECT).dir)/%.cmti)
 INSTALL_CMTS = $($(PROJECT).public:%=$(BUILDDIR)/$($(PROJECT).dir)/%.cmt)
 INSTALL_MLIS = $($(PROJECT).public:%=$($(PROJECT).dir)/%.mli)
+INSTALL_MLS = $($(PROJECT).public:%=$($(PROJECT).dir)/%.ml)
 INSTALL_HEADERS = $(wildcard $($(PROJECT).dir)/*.h) $($(PROJECT).extra_hs)
 THREAD_FLAG = $(if $(filter yes,$($(PROJECT).threads)),-thread)
 LINK_FLAGS = $(as_needed_flags) $($(PROJECT).link_flags)