5 files changed, 6 insertions, 10 deletions
diff --git a/bootstraptest/test_insns.rb b/bootstraptest/test_insns.rb
index abfb53f7dc..8addbf7b83 100644
--- a/bootstraptest/test_insns.rb
+++ b/bootstraptest/test_insns.rb
@@ -412,8 +412,6 @@ tests = [
     class String; def =~ other; true; end; end
     'true' =~ /true/
   },
-
-  [ 'opt_call_c_function', 'Struct.new(:x).new.x = true', ],
 ]
 
 # normal path
diff --git a/insns.def b/insns.def
index ba95655f9f..2257bcd148 100644
--- a/insns.def
+++ b/insns.def
@@ -1455,7 +1455,7 @@ opt_regexpmatch2
 }
 
 /* call native compiled method */
-DEFINE_INSN
+DEFINE_INSN_IF(SUPPORT_CALL_C_FUNCTION)
 opt_call_c_function
 (rb_insn_func_t funcptr)
 ()
diff --git a/test/ruby/test_jit.rb b/test/ruby/test_jit.rb
index a5d5fb45a9..97c287f692 100644
--- a/test/ruby/test_jit.rb
+++ b/test/ruby/test_jit.rb
@@ -22,7 +22,6 @@ class TestJIT < Test::Unit::TestCase
   TEST_PENDING_INSNS = RubyVM::INSTRUCTION_NAMES.select { |n| n.start_with?('trace_') }.map(&:to_sym) + [
     # not supported yet
     :defineclass,
-    :opt_call_c_function,
 
     # to be tested
     :invokebuiltin,
@@ -613,10 +612,6 @@ class TestJIT < Test::Unit::TestCase
     assert_compile_once("'true' =~ /true/", result_inspect: '0', insns: %i[opt_regexpmatch2])
   end
 
-  def test_compile_insn_opt_call_c_function
-    skip "support this in opt_call_c_function (low priority)"
-  end
-
   def test_compile_insn_opt_invokebuiltin_delegate_leave
     insns = collect_insns(RubyVM::InstructionSequence.of("\x00".method(:unpack)).to_a)
     mark_tested_insn(:opt_invokebuiltin_delegate_leave, used_insns: insns)
diff --git a/tool/ruby_vm/views/mjit_compile.inc.erb b/tool/ruby_vm/views/mjit_compile.inc.erb
index c9755454ba..0d3678dfb5 100644
--- a/tool/ruby_vm/views/mjit_compile.inc.erb
+++ b/tool/ruby_vm/views/mjit_compile.inc.erb
@@ -16,8 +16,7 @@
 } -%>
 %
 % unsupported_insns = [
-%   'defineclass',         # low priority
-%   'opt_call_c_function', # low priority
+%   'defineclass', # low priority
 % ]
 %
 % opt_send_without_block = RubyVM::Instructions.find { |i| i.name == 'opt_send_without_block' }
diff --git a/vm_opts.h b/vm_opts.h
index 02d60e71fd..b0ca81f304 100644
--- a/vm_opts.h
+++ b/vm_opts.h
@@ -62,6 +62,10 @@
 #define OPT_SUPPORT_JOKE             0
 #endif
 
+#ifndef OPT_SUPPORT_CALL_C_FUNCTION
+#define OPT_SUPPORT_CALL_C_FUNCTION  0
+#endif
+
 #ifndef VM_COLLECT_USAGE_DETAILS
 #define VM_COLLECT_USAGE_DETAILS     0
 #endif