diff --git a/configs/z80sim/nsh/Make.defs b/configs/z80sim/nsh/Make.defs
index 75b6de6c83..6c95d3296f 100644
--- a/configs/z80sim/nsh/Make.defs
+++ b/configs/z80sim/nsh/Make.defs
@@ -83,7 +83,7 @@ define ARCHIVE
 endef
 
 define CLEAN
-	@rm -f *.asm *.rel *.lst *.rst *.sym *.adb *.lnk *.map *.mem *.ihx *.hex
+	@rm -f *.o *.asm *.rel *.lst *.rst *.sym *.adb *.lnk *.map *.mem *.ihx *.hex
 endef
 
 MKDEP			= $(TOPDIR)/tools/mkdeps.sh
diff --git a/configs/z80sim/ostest/Make.defs b/configs/z80sim/ostest/Make.defs
index 75b6de6c83..6c95d3296f 100644
--- a/configs/z80sim/ostest/Make.defs
+++ b/configs/z80sim/ostest/Make.defs
@@ -83,7 +83,7 @@ define ARCHIVE
 endef
 
 define CLEAN
-	@rm -f *.asm *.rel *.lst *.rst *.sym *.adb *.lnk *.map *.mem *.ihx *.hex
+	@rm -f *.o *.asm *.rel *.lst *.rst *.sym *.adb *.lnk *.map *.mem *.ihx *.hex
 endef
 
 MKDEP			= $(TOPDIR)/tools/mkdeps.sh
diff --git a/configs/z80sim/pashello/Make.defs b/configs/z80sim/pashello/Make.defs
index 75b6de6c83..6c95d3296f 100644
--- a/configs/z80sim/pashello/Make.defs
+++ b/configs/z80sim/pashello/Make.defs
@@ -83,7 +83,7 @@ define ARCHIVE
 endef
 
 define CLEAN
-	@rm -f *.asm *.rel *.lst *.rst *.sym *.adb *.lnk *.map *.mem *.ihx *.hex
+	@rm -f *.o *.asm *.rel *.lst *.rst *.sym *.adb *.lnk *.map *.mem *.ihx *.hex
 endef
 
 MKDEP			= $(TOPDIR)/tools/mkdeps.sh