diff --git a/SRC/dlaswlq.f b/SRC/dlaswlq.f
index 1fe888501..9c4ceb19c 100644
--- a/SRC/dlaswlq.f
+++ b/SRC/dlaswlq.f
@@ -218,7 +218,7 @@ SUBROUTINE DLASWLQ( M, N, MB, NB, A, LDA, T, LDT, WORK, LWORK,
         INFO = -2
       ELSE IF( MB.LT.1 .OR. ( MB.GT.M .AND. M.GT.0 ) ) THEN
         INFO = -3
-      ELSE IF( NB.LT.0 ) THEN
+      ELSE IF( NB.LE.0 ) THEN
         INFO = -4
       ELSE IF( LDA.LT.MAX( 1, M ) ) THEN
         INFO = -6