diff --git a/Makefile b/Makefile
index a1aaeef..adf1d13 100644
--- a/Makefile
+++ b/Makefile
@@ -582,7 +582,7 @@
   # engine support, and this option is made to silence them. Better use it
   # only when absolutely necessary, until there's a viable alternative to the
   # engine API.
-  OPTIONS_CFLAGS += -DOPENSSL_SUPPRESS_DEPRECATED
+  ENGINE_CFLAGS   = -DOPENSSL_SUPPRESS_DEPRECATED
 endif
 
 ifneq ($(USE_QUIC),)