diff --git a/R/Makefile b/R/Makefile
index 861a091a..7ff84010 100644
--- a/R/Makefile
+++ b/R/Makefile
@@ -88,7 +88,6 @@ STAGE2_BUILD = $(R_SOURCE)/build
 
 STAGE2_CPPFLAGS := $(STAGE2_CPPFLAGS)
 STAGE2_CPPFLAGS += -I$(WASM)/include
-STAGE2_CPPFLAGS += -s WASM_BIGINT
 STAGE2_CPPFLAGS += -fwasm-exceptions
 STAGE2_CPPFLAGS += -s SUPPORT_LONGJMP=wasm
 STAGE2_CPPFLAGS += -s USE_BZIP2=1