diff --git a/eolian_cxx/Makefile.am b/eolian_cxx/Makefile.am
index ece53188..df5a370b 100644
--- a/eolian_cxx/Makefile.am
+++ b/eolian_cxx/Makefile.am
@@ -138,10 +138,10 @@ eolian_cxx_callbacks_01_SOURCES = eolian_cxx_callbacks_01.cc
 	true $<
 
 %.eo.c: %.eo
-	$(AM_V_EOL)$(EOLIAN_GEN) $(EOLIAN_FLAGS) -gc -o c:$@ $<
+	$(AM_V_EOL)$(EOLIAN_GEN) $(EOLIAN_FLAGS) $(EOLIAN_GEN_FLAGS) -gc -o c:$@ $<
 
 %.eo.h: %.eo
-	$(AM_V_EOL)$(EOLIAN_GEN) $(EOLIAN_FLAGS) -gh -o h:$@ $<
+	$(AM_V_EOL)$(EOLIAN_GEN) $(EOLIAN_FLAGS) $(EOLIAN_GEN_FLAGS) -gh -o h:$@ $<
 
 examples: $(ECXX_EXAMPLE_EOS) $(GENERATED) $(EXTRA_PROGRAMS)