diff --git a/lib/libefivar/Makefile b/lib/libefivar/Makefile
index d7f7898e8446..b4368ce9e97c 100644
--- a/lib/libefivar/Makefile
+++ b/lib/libefivar/Makefile
@@ -64,4 +64,4 @@ WARNS?=		9
 
 .include <bsd.lib.mk>
 
-CFLAGS+= -Wno-cast-align -Wno-unused-parameter
+CFLAGS+= -fno-strict-aliasing -Wno-cast-align -Wno-unused-parameter