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-rw-r--r--include/ruby/io.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/ruby/io.h b/include/ruby/io.h
index bdde9844e2..8f0367707e 100644
--- a/include/ruby/io.h
+++ b/include/ruby/io.h
@@ -51,12 +51,12 @@ extern "C" {
RUBY_SYMBOL_EXPORT_BEGIN
-typedef struct {
+typedef PACKED_STRUCT(struct {
char *ptr; /* off + len <= capa */
int off;
int len;
int capa;
-} rb_io_buffer_t;
+}) rb_io_buffer_t;
typedef struct rb_io_t {
FILE *stdio_file; /* stdio ptr for read/write if available */