diff --git a/config/CONFIG.Vx b/config/CONFIG.Vx
index a7da8728a..b7c3b995e 100644
--- a/config/CONFIG.Vx
+++ b/config/CONFIG.Vx
@@ -86,6 +86,11 @@ ANSI = GCC
 CPLUSPLUS = $(CPLUSPLUS_$(TORNADO))
 LD_CXX = $(LD_$(CPLUSPLUS))
 
+#--------------------------------------------------
+# Override flags in CONFIG_COMMON
+GCC_DEP_CFLAGS = -D_REENTRANT
+G++_DEP_CFLAGS = -D_REENTRANT
+
 #--------------------------------------------------
 # Operating system flags
 OP_SYS_INCLUDES = -I$(VX_INCLUDE)