diff --git a/Makefile b/Makefile
index 2825fad16..90dc91d5d 100644
--- a/Makefile
+++ b/Makefile
@@ -22,7 +22,7 @@ FFI_DEPS:=$(addprefix $(FFI_PATH),$(FFI_DEPS))
 $(FFI_DEPS): build/.filecoin-install ;
 
 build/.filecoin-install: $(FFI_PATH)
-	FFI_BUILD_FROM_SOURCE=1 $(MAKE) -C $(FFI_PATH) $(FFI_DEPS:$(FFI_PATH)%=%)
+	$(MAKE) -C $(FFI_PATH) $(FFI_DEPS:$(FFI_PATH)%=%)
 	@touch $@
 
 MODULES+=$(FFI_PATH)