diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0793ef9e34dd..a029c1de3375 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,7 @@ Bug fixes:
 * Default `close_others` in `Process.exec` to false like Ruby 2.6 (#1798, @XrXr).
 * Don't clone methods when setting method to the same visibility (#1794, @XrXr).
 * BigDecimal() deal with large rationals precisely (#1797, @XrXr).
+* Make it possible to call `instance_exec` with `rb_block_call` (#1802, @XrXr).
 
 Compatibility:
 
diff --git a/lib/truffle/truffle/cext.rb b/lib/truffle/truffle/cext.rb
index 8becd8f49be4..5e222da9271b 100644
--- a/lib/truffle/truffle/cext.rb
+++ b/lib/truffle/truffle/cext.rb
@@ -1512,12 +1512,13 @@ def send_splatted(object, method, args)
   end
 
   def rb_block_call(object, method, args, func, data)
+    outer_self = self
     object.__send__(method, *args) do |*block_args|
       TrufflePrimitive.cext_unwrap(TrufflePrimitive.call_with_c_mutex(func, [
           TrufflePrimitive.cext_wrap(block_args.first),
           data,
           block_args.size, # argc
-          RARRAY_PTR(block_args), # argv
+          outer_self.RARRAY_PTR(block_args), # argv
           nil, # blockarg
       ]))
     end
diff --git a/spec/ruby/optional/capi/ext/kernel_spec.c b/spec/ruby/optional/capi/ext/kernel_spec.c
index 63a2ff843273..e98ae35067df 100644
--- a/spec/ruby/optional/capi/ext/kernel_spec.c
+++ b/spec/ruby/optional/capi/ext/kernel_spec.c
@@ -59,6 +59,14 @@ VALUE kernel_spec_rb_block_call_multi_arg(VALUE self, VALUE ary) {
   return rb_block_call(ary, rb_intern("inject"), 1, method_args, block_call_inject_multi_arg, Qnil);
 }
 
+static VALUE return_extra_data(RB_BLOCK_CALL_FUNC_ARGLIST(yield_value, extra_data)) {
+  return extra_data;
+}
+
+VALUE rb_block_call_extra_data(VALUE self, VALUE object) {
+  return rb_block_call(object, rb_intern("instance_exec"), 0, NULL, return_extra_data, object);
+}
+
 VALUE kernel_spec_rb_block_call_no_func(VALUE self, VALUE ary) {
   return rb_block_call(ary, rb_intern("map"), 0, NULL, NULL, Qnil);
 }
@@ -304,6 +312,7 @@ void Init_kernel_spec(void) {
   rb_define_method(cls, "rb_block_call", kernel_spec_rb_block_call, 1);
   rb_define_method(cls, "rb_block_call_multi_arg", kernel_spec_rb_block_call_multi_arg, 1);
   rb_define_method(cls, "rb_block_call_no_func", kernel_spec_rb_block_call_no_func, 1);
+  rb_define_method(cls, "rb_block_call_extra_data", rb_block_call_extra_data, 1);
   rb_define_method(cls, "rb_block_proc", kernel_spec_rb_block_proc, 0);
   rb_define_method(cls, "rb_block_lambda", kernel_spec_rb_block_lambda, 0);
   rb_define_method(cls, "rb_frame_this_func_test", kernel_spec_rb_frame_this_func, 0);
diff --git a/spec/ruby/optional/capi/kernel_spec.rb b/spec/ruby/optional/capi/kernel_spec.rb
index d123eb13ea9f..32cdd3f4218a 100644
--- a/spec/ruby/optional/capi/kernel_spec.rb
+++ b/spec/ruby/optional/capi/kernel_spec.rb
@@ -53,6 +53,11 @@
         i + 1
       end.should == [2, 4, 6]
     end
+
+    it "can pass extra data to the function" do
+      ary = [3]
+      @s.rb_block_call_extra_data(ary).should equal(ary)
+    end
   end
 
   describe "rb_frame_this_func" do