diff --git a/mach/i80/ncg/table b/mach/i80/ncg/table
index b9a2b49dc..bfc21334d 100644
--- a/mach/i80/ncg/table
+++ b/mach/i80/ncg/table
@@ -1687,7 +1687,7 @@ pat cmu zlt $1==2
       uses areg
       gen
          mov a, %2.2
-         sbi {const1, %1.num & 0xff}
+         sui {const1, %1.num & 0xff}
          mov a, %2.1
          sbi {const1, %1.num >> 8}
          jc {label, $2}
@@ -1719,7 +1719,7 @@ pat cmu zge $1==2
       uses areg
       gen
          mov a, %2.2
-         sbi {const1, %1.num & 0xff}
+         sui {const1, %1.num & 0xff}
          mov a, %2.1
          sbi {const1, %1.num >> 8}
          jnc {label, $2}
diff --git a/tests/plat/core/cmu_e.e b/tests/plat/core/cmu_e.e
index 62b83d798..addb8e7e7 100644
--- a/tests/plat/core/cmu_e.e
+++ b/tests/plat/core/cmu_e.e
@@ -16,6 +16,8 @@ zero
     rom 0
 one
     rom 1
+twofivesix
+    rom 256
 big
     #if EM_WSIZE == 2
         rom 32767
@@ -107,5 +109,18 @@ big
     asp EM_WSIZE
 7
 
+    /* Test case: twofixsix < 256 */
+
+    loe twofivesix
+    loc 256
+    cmu EM_WSIZE
+    zlt *8
+    bra *9
+8
+    loc __LINE__
+    cal $fail
+    asp EM_WSIZE
+9
+
     cal $finished
     end