diff --git a/Exec/Make.Castro b/Exec/Make.Castro
index 4a645154ef..2db7d6aa36 100644
--- a/Exec/Make.Castro
+++ b/Exec/Make.Castro
@@ -298,8 +298,6 @@ Bpack	+= $(foreach dir, $(Pdirs), $(AMREX_HOME)/Src/$(dir)/Make.package)
 # directory
 NETWORK_OUTPUT_PATH = $(CASTRO_AUTO_SOURCE_DIR)
 
-USE_CXX_EOS := TRUE
-
 include $(MICROPHYSICS_HOME)/Make.Microphysics_extern
 
 Bpack += $(foreach dir, $(EXTERN_CORE), $(dir)/Make.package)