diff --git a/src/Makefile.am b/src/Makefile.am
index 12908f0..c100380 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -95,7 +95,7 @@ libdivecomputer.exp: libdivecomputer.symbols
 	$(AM_V_GEN) sed -e '/^$$/d' $< > $@
 
 .rc.lo:
-	$(AM_V_GEN) $(LIBTOOL) --silent --tag=RC --mode=compile $(RC) $< -o $@
+	$(AM_V_GEN) $(LIBTOOL) --silent --tag=CC --mode=compile $(RC) $(DEFS) $(DEFAULT_INCLUDES) $< -o $@
 
 libdivecomputer.lo: revision.h