diff --git a/prism/extension.c b/prism/extension.c
index 9375273ac5..e67ea9b9dc 100644
--- a/prism/extension.c
+++ b/prism/extension.c
@@ -1065,35 +1065,6 @@ named_captures(VALUE self, VALUE source) {
     return names;
 }
 
-/**
- * call-seq:
- *   Debug::integer_parse(source) -> [Integer, String]
- *
- * Parses the given source string and returns the integer it represents, as well
- * as a decimal string representation.
- */
-static VALUE
-integer_parse(VALUE self, VALUE source) {
-    const uint8_t *start = (const uint8_t *) RSTRING_PTR(source);
-    size_t length = RSTRING_LEN(source);
-
-    pm_integer_t integer = { 0 };
-    pm_integer_parse(&integer, PM_INTEGER_BASE_UNKNOWN, start, start + length);
-
-    pm_buffer_t buffer = { 0 };
-    pm_integer_string(&buffer, &integer);
-
-    VALUE string = rb_str_new(pm_buffer_value(&buffer), pm_buffer_length(&buffer));
-    pm_buffer_free(&buffer);
-
-    VALUE result = rb_ary_new_capa(2);
-    rb_ary_push(result, pm_integer_new(&integer));
-    rb_ary_push(result, string);
-    pm_integer_free(&integer);
-
-    return result;
-}
-
 /**
  * call-seq:
  *   Debug::memsize(source) -> { length: xx, memsize: xx, node_count: xx }
@@ -1376,7 +1347,6 @@ Init_prism(void) {
     // internal tasks. We expose these to make them easier to test.
     VALUE rb_cPrismDebug = rb_define_module_under(rb_cPrism, "Debug");
     rb_define_singleton_method(rb_cPrismDebug, "named_captures", named_captures, 1);
-    rb_define_singleton_method(rb_cPrismDebug, "integer_parse", integer_parse, 1);
     rb_define_singleton_method(rb_cPrismDebug, "memsize", memsize, 1);
     rb_define_singleton_method(rb_cPrismDebug, "profile_file", profile_file, 1);
     rb_define_singleton_method(rb_cPrismDebug, "format_errors", format_errors, 2);
diff --git a/prism/util/pm_integer.c b/prism/util/pm_integer.c
index 015789ccec..ab6ac78b5c 100644
--- a/prism/util/pm_integer.c
+++ b/prism/util/pm_integer.c
@@ -471,7 +471,7 @@ pm_integer_parse_big(pm_integer_t *integer, uint32_t multiplier, const uint8_t *
  * has already been validated, as internal validation checks are not performed
  * here.
  */
-PRISM_EXPORTED_FUNCTION void
+void
 pm_integer_parse(pm_integer_t *integer, pm_integer_base_t base, const uint8_t *start, const uint8_t *end) {
     // Ignore unary +. Unary - is parsed differently and will not end up here.
     // Instead, it will modify the parsed integer later.
diff --git a/prism/util/pm_integer.h b/prism/util/pm_integer.h
index d2a1808b19..1ede1f12b9 100644
--- a/prism/util/pm_integer.h
+++ b/prism/util/pm_integer.h
@@ -82,7 +82,7 @@ typedef enum {
  * @param start The start of the string.
  * @param end The end of the string.
  */
-PRISM_EXPORTED_FUNCTION void pm_integer_parse(pm_integer_t *integer, pm_integer_base_t base, const uint8_t *start, const uint8_t *end);
+void pm_integer_parse(pm_integer_t *integer, pm_integer_base_t base, const uint8_t *start, const uint8_t *end);
 
 /**
  * Return the memory size of the integer.
diff --git a/test/prism/integer_parse_test.rb b/test/prism/integer_parse_test.rb
index f42e817e79..11aee174c5 100644
--- a/test/prism/integer_parse_test.rb
+++ b/test/prism/integer_parse_test.rb
@@ -2,8 +2,6 @@
 
 require_relative "test_helper"
 
-return if Prism::BACKEND == :FFI
-
 module Prism
   class IntegerParseTest < TestCase
     def test_integer_parse
@@ -37,9 +35,7 @@ module Prism
     private
 
     def assert_integer_parse(expected, source = expected.to_s)
-      integer, string = Debug.integer_parse(source)
-      assert_equal expected, integer
-      assert_equal expected.to_s, string
+      assert_equal expected, Prism.parse(source).value.statements.body.first.value
     end
   end
 end