diff --git a/make/plugin.mk b/make/plugin.mk
index 509cd60a..f5273cd5 100644
--- a/make/plugin.mk
+++ b/make/plugin.mk
@@ -8,6 +8,9 @@ include $(MODDIR)/make/plugin-defs.mk
 include $(MODDIR)/make/rules.mk
 include $(MODDIR)/make/depend.mk
 
+LOCAL_CPPFLAGS += -D_PLUGIN
+LOCAL_CFLAGS   += -D_PLUGIN
+
 ifeq ($(INSTALLED_PLUGIN),)
 INSTALLED_PLUGIN = $(INSTALL_LIBDIR)/$(PLUGIN)
 endif