diff --git a/Makefile b/Makefile
index 61cbdd5..4cda4b3 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 MIX = mix
 
 ERLANG_PATH = $(shell erl -eval 'io:format("~s", [lists:concat([code:root_dir(), "/erts-", erlang:system_info(version), "/include"])])' -s init stop -noshell)
-CFLAGS += -I$(ERLANG_PATH)
+CFLAGS += -I"$(ERLANG_PATH)"
 CFLAGS += -I c_src/secp256k1 -I c_src/secp256k1/src -I c_src/secp256k1/include
 
 ifeq ($(wildcard deps/libsecp256k1),)