diff --git a/module/language/assembly/compile-bytecode.scm b/module/language/assembly/compile-bytecode.scm
index d92821cc9..e6fc5bc2a 100644
--- a/module/language/assembly/compile-bytecode.scm
+++ b/module/language/assembly/compile-bytecode.scm
@@ -137,6 +137,9 @@
         ((br-if-not-eq ,l) (write-break l))
         ((br-if-null ,l) (write-break l))
         ((br-if-not-null ,l) (write-break l))
+        ((br-if-nargs-ne ,hi ,lo ,l) (write-byte hi) (write-byte lo) (write-break l))
+        ((br-if-nargs-lt ,hi ,lo ,l) (write-byte hi) (write-byte lo) (write-break l))
+        ((br-if-nargs-gt ,hi ,lo ,l) (write-byte hi) (write-byte lo) (write-break l))
         ((mv-call ,n ,l) (write-byte n) (write-break l))
         (else
          (cond
diff --git a/module/language/assembly/decompile-bytecode.scm b/module/language/assembly/decompile-bytecode.scm
index 6c929cb33..555ee12d7 100644
--- a/module/language/assembly/decompile-bytecode.scm
+++ b/module/language/assembly/decompile-bytecode.scm
@@ -42,6 +42,8 @@
 
 (define (br-instruction? x)
   (memq x '(br br-if br-if-not br-if-eq br-if-not-eq br-if-null br-if-not-null)))
+(define (br-nargs-instruction? x)
+  (memq x '(br-if-nargs-ne br-if-nargs-lt br-if-nargs-gt)))
 
 (define (bytes->s24 a b c)
   (let ((x (+ (ash a 16) (ash b 8) c)))
@@ -84,6 +86,8 @@
                (pmatch exp
                  ((,br ,rel1 ,rel2 ,rel3) (guard (br-instruction? br))
                   (lp (cons `(,br ,(ensure-label rel1 rel2 rel3)) out)))
+                 ((,br ,hi ,lo ,rel1 ,rel2 ,rel3) (guard (br-nargs-instruction? br))
+                  (lp (cons `(,br ,hi ,lo ,(ensure-label rel1 rel2 rel3)) out)))
                  ((mv-call ,n ,rel1 ,rel2 ,rel3)
                   (lp (cons `(mv-call ,n ,(ensure-label rel1 rel2 rel3)) out)))
                  (else 
diff --git a/module/language/assembly/disassemble.scm b/module/language/assembly/disassemble.scm
index ae2d32787..2c0ad4fcb 100644
--- a/module/language/assembly/disassemble.scm
+++ b/module/language/assembly/disassemble.scm
@@ -132,6 +132,8 @@
        (list "~a element~:p" (apply make-int16 args)))
       ((br br-if br-if-eq br-if-not br-if-not-eq br-if-not-null br-if-null)
        (list "-> ~A" (assq-ref labels (car args))))
+      ((br-if-nargs-ne br-if-nargs-lt br-if-nargs-gt)
+       (list "-> ~A" (assq-ref labels (caddr args))))
       ((object-ref)
        (and objs (list "~s" (vector-ref objs (car args)))))
       ((local-ref local-boxed-ref local-set local-boxed-set)