diff --git a/lib/arm-mes/arm.M1 b/lib/arm-mes/arm.M1
index c3e7c2e1..1182baf1 100644
--- a/lib/arm-mes/arm.M1
+++ b/lib/arm-mes/arm.M1
@@ -179,6 +179,7 @@ DEFINE ldrsb__%r2,(%r2) d020d2e1  # ldrsb   r2, [r2]
 DEFINE ldrsb__%r3,(%r3) d030d3e1  # ldrsb   r3, [r3]
 DEFINE ldrsb__%r4,(%r4) d040d4e1  # ldrsb   r4, [r4]
 DEFINE ldrsb__%r5,(%r5) d050d5e1  # ldrsb   r5, [r5]
+DEFINE ldrb___%r0,(%r1) 0000d1e5  # ldrb    r0, [r1]
 DEFINE ldrh___%r0,(%r0) b000d0e1  # ldrh    r0, [r0]
 DEFINE ldrh___%r1,(%r1) b010d1e1  # ldrh    r1, [r1]
 DEFINE ldrh___%r2,(%r2) b020d2e1  # ldrh    r2, [r2]
diff --git a/module/mescc/armv4/as.scm b/module/mescc/armv4/as.scm
index 20228716..ef6b1379 100644
--- a/module/mescc/armv4/as.scm
+++ b/module/mescc/armv4/as.scm
@@ -126,8 +126,8 @@
 (define (armv4:r-byte-mem-add info v)
   (let ((r (get-r info)))
     `((,(string-append "push___%r0"))
-      (,(string-append "ldbrs__%r0,(%" r ")"))
-      ((#:immediate1 ,v) ,(string-append "addb___$i8,%r0"))
+      (,(string-append "ldrb___%r0,(%" r ")"))
+      ((#:immediate1 ,v) ,(string-append "add____$i8,%r0"))
       (,(string-append "strb___%r0,(%" r ")"))
       (,(string-append "pop____%r0")))))