diff --git a/ChangeLog.d/muladdc_microblaze.txt b/ChangeLog.d/muladdc_microblaze.txt
new file mode 100644
index 000000000..70fdff020
--- /dev/null
+++ b/ChangeLog.d/muladdc_microblaze.txt
@@ -0,0 +1,3 @@
+Bugfix
+   * Fix support for little-endian Microblaze when MBEDTLS_HAVE_ASM is defined.
+     Contributed by Kazuyuki Kimura to fix #2020.
diff --git a/library/bn_mul.h b/library/bn_mul.h
index 831e1d7f2..34719b995 100644
--- a/library/bn_mul.h
+++ b/library/bn_mul.h
@@ -582,10 +582,20 @@
         "andi  r7,   r6, 0xffff \n\t"   \
         "bsrli r6,   r6, 16     \n\t"
 
-#define MULADDC_X1_CORE                 \
+#if(__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
+#define MULADDC_LHUI                    \
+        "lhui  r9,   r3,   0    \n\t"   \
+        "addi  r3,   r3,   2    \n\t"   \
+        "lhui  r8,   r3,   0    \n\t"
+#else
+#define MULADDC_LHUI                    \
         "lhui  r8,   r3,   0    \n\t"   \
         "addi  r3,   r3,   2    \n\t"   \
-        "lhui  r9,   r3,   0    \n\t"   \
+        "lhui  r9,   r3,   0    \n\t"
+#endif
+
+#define MULADDC_X1_CORE                    \
+        MULADDC_LHUI                    \
         "addi  r3,   r3,   2    \n\t"   \
         "mul   r10,  r9,  r6    \n\t"   \
         "mul   r11,  r8,  r7    \n\t"   \