diff --git a/param.h b/param.h
index 66eedc798..259592cdf 100644
--- a/param.h
+++ b/param.h
@@ -2243,7 +2243,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define GEMM_DEFAULT_OFFSET_B 1024
 #define GEMM_DEFAULT_ALIGN 0x0ffffUL
 
-#define SGEMM_DEFAULT_UNROLL_M 16
+#define SGEMM_DEFAULT_UNROLL_M 4
 #define SGEMM_DEFAULT_UNROLL_N 4
 #define DGEMM_DEFAULT_UNROLL_M 4
 #define DGEMM_DEFAULT_UNROLL_N 4