diff --git a/Makefile b/Makefile
index 918fdff2..d4144e45 100644
--- a/Makefile
+++ b/Makefile
@@ -34,7 +34,7 @@ ifeq ($(GOOS), linux)
 	PROMU_CONF ?= .promu.yml
 else
 	ifndef GOOS
-		ifeq ($(GOHOSTOS), Linux)
+		ifeq ($(GOHOSTOS), linux)
 			PROMU_CONF ?= .promu.yml
 		else
 			PROMU_CONF ?= .promu-cgo.yml