diff --git a/libexec/rtld-elf/amd64/lockdflt.c b/libexec/rtld-elf/amd64/lockdflt.c
index fd74cbaeb8cf..b3b49350bab4 100644
--- a/libexec/rtld-elf/amd64/lockdflt.c
+++ b/libexec/rtld-elf/amd64/lockdflt.c
@@ -55,7 +55,7 @@
 #include "debug.h"
 #include "rtld.h"
 
-#define CACHE_LINE_SIZE		32
+#define CACHE_LINE_SIZE		64
 
 #define WAFLAG		0x1	/* A writer holds the lock */
 #define RC_INCR		0x2	/* Adjusts count of readers desiring lock */