diff --git a/rtl/embedded/Makefile b/rtl/embedded/Makefile
index 3647327daf..105b7f2ba5 100644
--- a/rtl/embedded/Makefile
+++ b/rtl/embedded/Makefile
@@ -2935,3 +2935,5 @@ intrinsics$(PPUEXT) : $(PROCINC)/intrinsics.pp $(SYSTEMUNIT)$(PPUEXT)
 	$(COMPILER) $(PROCINC)/intrinsics.pp
 sortbase$(PPUEXT) : $(INC)/sortbase.pp objpas$(PPUEXT) $(SYSTEMUNIT)$(PPUEXT)
 	$(COMPILER) $(INC)/sortbase.pp
+avrsim$(PPUEXT): $(ARCH)/avrsim.pp heapmgr$(PPUEXT) consoleio$(PPUEXT) $(SYSTEMUNIT)$(PPUEXT)
+	$(COMPILER) $(ARCH)/avrsim.pp
diff --git a/rtl/embedded/Makefile.fpc b/rtl/embedded/Makefile.fpc
index 049ea7722d..cb55006786 100644
--- a/rtl/embedded/Makefile.fpc
+++ b/rtl/embedded/Makefile.fpc
@@ -426,3 +426,9 @@ intrinsics$(PPUEXT) : $(PROCINC)/intrinsics.pp $(SYSTEMUNIT)$(PPUEXT)
 
 sortbase$(PPUEXT) : $(INC)/sortbase.pp objpas$(PPUEXT) $(SYSTEMUNIT)$(PPUEXT)
 	$(COMPILER) $(INC)/sortbase.pp
+
+# AVR specific units
+
+avrsim$(PPUEXT): $(ARCH)/avrsim.pp heapmgr$(PPUEXT) consoleio$(PPUEXT) $(SYSTEMUNIT)$(PPUEXT)
+	$(COMPILER) $(ARCH)/avrsim.pp
+