diff --git a/lapack-netlib/SRC/csytrf.f b/lapack-netlib/SRC/csytrf.f
index ebf228f18..951196b83 100644
--- a/lapack-netlib/SRC/csytrf.f
+++ b/lapack-netlib/SRC/csytrf.f
@@ -232,7 +232,7 @@
 *        Determine the block size
 *
          NB = ILAENV( 1, 'CSYTRF', UPLO, N, -1, -1, -1 )
-         LWKOPT = N*NB
+         LWKOPT = MAX( 1, N*NB )
          WORK( 1 ) = LWKOPT
       END IF
 *