diff --git a/Makefile b/Makefile
index 91e6bcd..6ed5ba7 100644
--- a/Makefile
+++ b/Makefile
@@ -63,7 +63,7 @@ shim_cert.h: shim.cer
 
 version.c : version.c.in
 	sed	-e "s,@@VERSION@@,$(VERSION)," \
-		-e "s,@@UNAME@@,$(shell uname -a)," \
+		-e "s,@@UNAME@@,$(shell uname -o)," \
 		-e "s,@@COMMIT@@,$(shell if [ -d .git ] ; then git log -1 --pretty=format:%H ; elif [ -f commit ]; then cat commit ; else echo commit id not available; fi)," \
 		< version.c.in > version.c