diff --git a/Makefile b/Makefile
index ef796bc..2c2950c 100644
--- a/Makefile
+++ b/Makefile
@@ -11,6 +11,13 @@ image_eif := $(prog).eif
 cover_out = cover.out
 cover_html = cover.html
 
+# Use sha1sum on Linux and sha1 on macOS.
+ifeq ($(shell uname),Darwin)
+	hash = sha1
+else
+	hash = sha1sum
+endif
+
 all: $(prog)
 
 .PHONY: lint
@@ -83,11 +90,11 @@ $(prog): $(godeps)
 		-ldflags="-s -w" \
 		-buildvcs=false \
 		-o $(prog)
-	@sha1sum "$(prog_dir)/$(prog)"
+	@$(hash) "$(prog_dir)/$(prog)"
 
 $(verify_prog): $(godeps)
 	@go build -C $(verify_prog_dir) -o $(verify_prog)
-	@sha1sum "$(verify_prog_dir)/$(verify_prog)"
+	@$(hash) "$(verify_prog_dir)/$(verify_prog)"
 
 .PHONY: clean
 clean: