diff --git a/Makefile b/Makefile
index 0cc979b75..3c81251cf 100644
--- a/Makefile
+++ b/Makefile
@@ -151,7 +151,7 @@ ifdef ABC_USE_LIBSTDCXX
 endif
 
 $(info $(MSG_PREFIX)Using CFLAGS=$(CFLAGS))
-CXXFLAGS += $(CFLAGS) -std=c++17
+CXXFLAGS += $(CFLAGS) -std=c++11
 
 SRC  :=
 GARBAGE := core core.* *.stackdump ./tags $(PROG) arch_flags