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-rw-r--r--spec/ruby/optional/capi/ext/rubyspec.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/spec/ruby/optional/capi/ext/rubyspec.h b/spec/ruby/optional/capi/ext/rubyspec.h
index e5a90bfc88..63691d62fd 100644
--- a/spec/ruby/optional/capi/ext/rubyspec.h
+++ b/spec/ruby/optional/capi/ext/rubyspec.h
@@ -572,6 +572,7 @@
#define HAVE_RB_STRING 1
#define HAVE_SAFE_STRING_VALUE 1
#define HAVE_RB_STRING_VALUE_CSTR 1
+#define HAVE_RB_STR_MODIFY 1
/* Struct */
#define HAVE_RB_STRUCT_AREF 1