--- a/ports/unix/Makefile
+++ b/ports/unix/Makefile
@@ -31,7 +31,7 @@ QSTR_DEFS += qstrdefsport.h
 QSTR_GLOBAL_DEPENDENCIES += $(VARIANT_DIR)/mpconfigvariant.h
 
 # OS name, for simple autoconfig
-UNAME_S := $(shell uname -s)
+UNAME_S := Linux
 
 # include py core make definitions
 include $(TOP)/py/py.mk
