diff --git a/rtl/openbsd/Makefile.fpc b/rtl/openbsd/Makefile.fpc
index 29c6850cd2..9fe2133681 100644
--- a/rtl/openbsd/Makefile.fpc
+++ b/rtl/openbsd/Makefile.fpc
@@ -250,7 +250,11 @@ macpas$(PPUEXT) : $(INC)/macpas.pp objpas$(PPUEXT) math$(PPUEXT)
 # Other system-independent RTL Units
 #
 
+ifeq ($(ARCH),x86_64)
+cpu$(PPUEXT) : $(PROCINC)/cpu.pp $(SYSTEMUNIT)$(PPUEXT) sysutils$(PPUEXT)
+else
 cpu$(PPUEXT) : $(PROCINC)/cpu.pp $(SYSTEMUNIT)$(PPUEXT)
+endif
 
 mmx$(PPUEXT) : $(PROCINC)/mmx.pp cpu$(PPUEXT) $(SYSTEMUNIT)$(PPUEXT)