diff --git a/kernel/x86_64/KERNEL.ZEN b/kernel/x86_64/KERNEL.ZEN
index 025db515e..98cd38dfa 100644
--- a/kernel/x86_64/KERNEL.ZEN
+++ b/kernel/x86_64/KERNEL.ZEN
@@ -95,5 +95,5 @@ ZTRSMKERNEL_RN	= ../generic/trsm_kernel_RN.c
 ZTRSMKERNEL_RT	= ../generic/trsm_kernel_RT.c
 
 CGEMM3MKERNEL    =  cgemm3m_kernel_8x4_haswell.c
-ZGEMM3MKERNEL    =  zgemm3m_kernel_2x8_nehalem.S
+ZGEMM3MKERNEL    =  zgemm3m_kernel_4x4_haswell.c