diff --git a/Makefile.pre.in b/Makefile.pre.in
index 87a84eb68083ae..669972d21a6476 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -1444,11 +1444,21 @@ inclinstall:
 		else	true; \
 		fi; \
 	done
+	@if test ! -d $(DESTDIR)$(INCLUDEPY)/internal; then \
+		echo "Creating directory $(DESTDIR)$(INCLUDEPY)/internal"; \
+		$(INSTALL) -d -m $(DIRMODE) $(DESTDIR)$(INCLUDEPY)/internal; \
+	else	true; \
+	fi
 	@for i in $(srcdir)/Include/*.h; \
 	do \
 		echo $(INSTALL_DATA) $$i $(INCLUDEPY); \
 		$(INSTALL_DATA) $$i $(DESTDIR)$(INCLUDEPY); \
 	done
+	@for i in $(srcdir)/Include/internal/*.h; \
+	do \
+		echo $(INSTALL_DATA) $$i $(INCLUDEPY)/internal; \
+		$(INSTALL_DATA) $$i $(DESTDIR)$(INCLUDEPY)/internal; \
+	done
 	$(INSTALL_DATA) pyconfig.h $(DESTDIR)$(CONFINCLUDEPY)/pyconfig.h
 
 # Install the library and miscellaneous stuff needed for extending/embedding
diff --git a/Misc/NEWS.d/next/C API/2018-11-22-18-34-23.bpo-35296.nxrIQt.rst b/Misc/NEWS.d/next/C API/2018-11-22-18-34-23.bpo-35296.nxrIQt.rst
new file mode 100644
index 00000000000000..c5f877a4e323d9
--- /dev/null
+++ b/Misc/NEWS.d/next/C API/2018-11-22-18-34-23.bpo-35296.nxrIQt.rst	
@@ -0,0 +1,2 @@
+``make install`` now also installs the internal API:
+``Include/internal/*.h`` header files.