diff --git a/kernel/x86_64/KERNEL.ZEN b/kernel/x86_64/KERNEL.ZEN
index 7cec2e5ed..ed14a52da 100644
--- a/kernel/x86_64/KERNEL.ZEN
+++ b/kernel/x86_64/KERNEL.ZEN
@@ -30,8 +30,8 @@ DAXPYKERNEL = daxpy.c
 CAXPYKERNEL = caxpy.c
 ZAXPYKERNEL = zaxpy.c
 
-STRMMKERNEL    =  sgemm_kernel_8x4_haswell.c
-SGEMMKERNEL    =  sgemm_kernel_8x4_haswell.c
+STRMMKERNEL    =  sgemm_kernel_16x4_haswell.S
+SGEMMKERNEL    =  sgemm_kernel_16x4_haswell.S
 SGEMMINCOPY    =  ../generic/gemm_ncopy_8.c
 SGEMMITCOPY    =  ../generic/gemm_tcopy_8.c
 SGEMMONCOPY    =  ../generic/gemm_ncopy_4.c
diff --git a/param.h b/param.h
index e6ab93aa5..3c495af05 100644
--- a/param.h
+++ b/param.h
@@ -666,7 +666,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #else
 
-#define SGEMM_DEFAULT_P 320
+#define SGEMM_DEFAULT_P 768
 #define DGEMM_DEFAULT_P 512
 #define CGEMM_DEFAULT_P 256
 #define ZGEMM_DEFAULT_P 192