--- a/tests/Makefile	2023-01-19 21:02:36.678227862 +0100
+++ b/tests/Makefile	2023-01-19 21:03:01.140832955 +0100
@@ -11,7 +11,8 @@
 COMLIBS=$(COMLIBS_$(OSTYPE))
 COMLIBS_win32=advapi32.lib ole32.lib oleaut32.lib
 
-all: ../caml/camlidlruntime.h $(TESTS:.idl=.$(OBJEXT)) testcomp
+all: ../caml/camlidlruntime.h
+	$(MAKE) $(TESTS:.idl=.$(OBJEXT)) testcomp
 
 $(TESTS:.idl=.$(OBJEXT)) component.$(OBJEXT): $(CAMLIDL) ../runtime/camlidlruntime.h