diff --git a/config/CONFIG_COMMON b/config/CONFIG_COMMON
index 790dbfb52..73ccfd8f0 100644
--- a/config/CONFIG_COMMON
+++ b/config/CONFIG_COMMON
@@ -244,7 +244,7 @@ LDFLAGS = $(OPT_LDFLAGS) $(TARGET_LDFLAGS) $(USR_LDFLAGS)\
 LDLIBS = $(TARGET_LDLIBS) $(USR_LDLIBS) $(STATIC_LDLIBS) $(ARCH_DEP_LDLIBS)\
   $(OP_SYS_LDLIBS) $(POSIX_LDLIBS)
 
-CPPFLAGS += $(TARGET_CPPFLAGS) $(USR_CPPFLAGS) $(ARCH_DEP_CPPFLAGS) $(POSIX_CPPFLAGS)
+CPPFLAGS += $(TARGET_CPPFLAGS) $(USR_CPPFLAGS) $(ARCH_DEP_CPPFLAGS) $(POSIX_CPPFLAGS)  $(OP_SYS_CPPFLAGS)
 
 CPPSNCFLAGS = $(INCLUDES)