diff --git a/GNUmakefile b/GNUmakefile
index 6485e90ea74..4b90e07cda6 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -92,7 +92,7 @@ endif
 # -----------------------------------------------------------------------------
 # Blender binary path
 
-ifeq ($(OS), darwin)
+ifeq ($(OS), Darwin)
 	BLENDER_BIN="$(BUILD_DIR)/bin/blender.app/Contents/MacOS/blender"
 else
 	BLENDER_BIN="$(BUILD_DIR)/bin/blender"