diff --git a/ChangeLog b/ChangeLog
index fa71cb8701..113a99ddae 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -8,6 +8,8 @@ Bugfix
    * Fix for redefinition of _WIN32_WINNT to avoid overriding a definition
      used by user applications. Found and fixed by Fabio Alessandrelli.
    * Fix braces in mbedtls_memory_buffer_alloc_status(). Found by sbranden, #552.
+   * Fix an issue with MicroBlaze support in bn_mul.h which was causing the
+     build to fail. Found by zv-io. Fixes #1651.
 
 Changes
    * Support TLS testing in out-of-source builds using cmake. Fixes #1193.
diff --git a/include/mbedtls/bn_mul.h b/include/mbedtls/bn_mul.h
index 354c1cc1ab..f4b2b561d1 100644
--- a/include/mbedtls/bn_mul.h
+++ b/include/mbedtls/bn_mul.h
@@ -521,7 +521,7 @@
         "swi   r3,   %2         \n\t"   \
         : "=m" (c), "=m" (d), "=m" (s)              \
         : "m" (s), "m" (d), "m" (c), "m" (b)        \
-        : "r3", "r4"  "r5", "r6", "r7", "r8",       \
+        : "r3", "r4", "r5", "r6", "r7", "r8",       \
           "r9", "r10", "r11", "r12", "r13"          \
     );