diff --git a/prism_compile.c b/prism_compile.c
index be47806fbd..8c4f0fed0a 100644
--- a/prism_compile.c
+++ b/prism_compile.c
@@ -2711,7 +2711,12 @@ pm_compile_call(rb_iseq_t *iseq, const pm_call_node_t *call_node, LINK_ANCHOR *c
     }
 
     if (pm_node->flags & PM_CALL_NODE_FLAGS_ATTRIBUTE_WRITE) {
-        if (flags & VM_CALL_ARGS_SPLAT) {
+        if (flags & VM_CALL_ARGS_BLOCKARG) {
+            ADD_INSN1(ret, &dummy_line_node, topn, INT2FIX(1));
+            ADD_INSN1(ret, &dummy_line_node, setn, INT2FIX(orig_argc + 3));
+            PM_POP;
+        }
+        else if (flags & VM_CALL_ARGS_SPLAT) {
             ADD_INSN(ret, &dummy_line_node, dup);
             ADD_INSN1(ret, &dummy_line_node, putobject, INT2FIX(-1));
             ADD_SEND_WITH_FLAG(ret, &dummy_line_node, idAREF, INT2FIX(1), INT2FIX(0));
diff --git a/test/ruby/test_compile_prism.rb b/test/ruby/test_compile_prism.rb
index 29f0530462..7705959f4c 100644
--- a/test/ruby/test_compile_prism.rb
+++ b/test/ruby/test_compile_prism.rb
@@ -1762,6 +1762,15 @@ end
         obj[*[1]] = 3
       RUBY
 
+      # Test passing block inside of []=
+      assert_prism_eval(<<~RUBY)
+        obj = Object.new
+        def obj.[]=(a); end
+
+        p = proc {}
+        obj[&p] = 4
+      RUBY
+
       assert_prism_eval(<<-CODE)
         def self.prism_opt_var_trail_hash(a = nil, *b, c, **d); end
         prism_opt_var_trail_hash("a")