diff --git a/kernel/x86_64/KERNEL b/kernel/x86_64/KERNEL
index f8278c3b4..ec4290e82 100644
--- a/kernel/x86_64/KERNEL
+++ b/kernel/x86_64/KERNEL
@@ -489,5 +489,7 @@ XGEMM3MKERNEL    =  xgemm3m_kernel_2x2.S
 
 SSUMKERNEL = ../arm/sum.c
 DSUMKERNEL = ../arm/sum.c
+CSUMKERNEL = zsum_sse.S
+ZSUMKERNEL = zsum_sse2.S
 
 SOMATCOPY_RT = omatcopy_rt.c
diff --git a/kernel/x86_64/KERNEL.SKYLAKEX b/kernel/x86_64/KERNEL.SKYLAKEX
index 548e5dcfc..7e946ef2e 100644
--- a/kernel/x86_64/KERNEL.SKYLAKEX
+++ b/kernel/x86_64/KERNEL.SKYLAKEX
@@ -46,3 +46,5 @@ ZGEMMKERNEL    =  zgemm_kernel_4x2_skylakex.c
 
 CASUMKERNEL = casum.c
 ZASUMKERNEL = zasum.c
+CSUMKERNEL = csum.c
+ZSUMKERNEL = zsum.c