diff --git a/Makefile b/Makefile
index 7e3b2dd..82db7e5 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,19 @@
+
+UNAME := $(shell uname)
+
+ifeq ($(UNAME), Linux)
+	artefact = libecrecover.so
+endif
+ifeq ($(UNAME), Darwin)
+	artefact = libecrecover.dylib
+endif
+
+
 all: priv/ecrecover.so
 
 priv/ecrecover.so: src/lib.rs parity-ethereum/
 	cargo build --release
-	cp target/release/libecrecover.so priv/ecrecover.so
+	cp target/release/$(artefact) priv/ecrecover.so
 
 clean:
 	rm -f src/ecrecover.so target/release/libecrecover.so