diff --git a/src/osgProducer/Makefile b/src/osgProducer/Makefile
index 8b96a0c58..35d930412 100644
--- a/src/osgProducer/Makefile
+++ b/src/osgProducer/Makefile
@@ -13,7 +13,7 @@ DEF  += -DOSGPRODUCER_LIBRARY
 TARGET_BASENAME = osgProducer
 LIB = $(LIB_PREFIX)$(TARGET_BASENAME).$(LIB_EXT)
 
-CXXFLAGS += $(PRODUCER_INCLUDE_DIR)
+INC += $(PRODUCER_INCLUDE_DIR)
 LDFLAGS  += $(PRODUCER_LIB_DIR)
 
 include $(TOPDIR)/Make/makerules