diff --git a/SRC/cunhr_col.f b/SRC/cunhr_col.f
index 49bc3f507..edc4002d8 100644
--- a/SRC/cunhr_col.f
+++ b/SRC/cunhr_col.f
@@ -421,7 +421,7 @@ SUBROUTINE CUNHR_COL( M, N, NB, A, LDA, T, LDT, D, INFO )
 *
          JBTEMP2 = JB - 2
          DO J = JB, JB+JNB-2
-            DO I = J-JBTEMP2, NB
+            DO I = J-JBTEMP2, MIN( NB, N )
                T( I, J ) = CZERO
             END DO
          END DO
diff --git a/SRC/dorhr_col.f b/SRC/dorhr_col.f
index c9fcb391c..2c7a0aee6 100644
--- a/SRC/dorhr_col.f
+++ b/SRC/dorhr_col.f
@@ -420,7 +420,7 @@ SUBROUTINE DORHR_COL( M, N, NB, A, LDA, T, LDT, D, INFO )
 *
          JBTEMP2 = JB - 2
          DO J = JB, JB+JNB-2
-            DO I = J-JBTEMP2, NB
+            DO I = J-JBTEMP2, MIN( NB, N )
                T( I, J ) = ZERO
             END DO
          END DO
diff --git a/SRC/sorhr_col.f b/SRC/sorhr_col.f
index cf9d985af..d1d5f131d 100644
--- a/SRC/sorhr_col.f
+++ b/SRC/sorhr_col.f
@@ -420,7 +420,7 @@ SUBROUTINE SORHR_COL( M, N, NB, A, LDA, T, LDT, D, INFO )
 *
          JBTEMP2 = JB - 2
          DO J = JB, JB+JNB-2
-            DO I = J-JBTEMP2, NB
+            DO I = J-JBTEMP2, MIN( NB, N )
                T( I, J ) = ZERO
             END DO
          END DO
diff --git a/SRC/zunhr_col.f b/SRC/zunhr_col.f
index 44a5ef74b..fab17eefd 100644
--- a/SRC/zunhr_col.f
+++ b/SRC/zunhr_col.f
@@ -421,7 +421,7 @@ SUBROUTINE ZUNHR_COL( M, N, NB, A, LDA, T, LDT, D, INFO )
 *
          JBTEMP2 = JB - 2
          DO J = JB, JB+JNB-2
-            DO I = J-JBTEMP2, NB
+            DO I = J-JBTEMP2, MIN( NB, N )
                T( I, J ) = CZERO
             END DO
          END DO