diff --git a/c_glib/arrow-glib/scalar.h b/c_glib/arrow-glib/scalar.h
index 9a81e05b368e5..4f2c44199f43b 100644
--- a/c_glib/arrow-glib/scalar.h
+++ b/c_glib/arrow-glib/scalar.h
@@ -529,7 +529,7 @@ struct _GArrowDecimal64ScalarClass
 GARROW_AVAILABLE_IN_19_0
 GArrowDecimal64Scalar *
 garrow_decimal64_scalar_new(GArrowDecimal64DataType *data_type, GArrowDecimal64 *value);
-GARROW_AVAILABLE_IN_5_0
+GARROW_AVAILABLE_IN_19_0
 GArrowDecimal64 *
 garrow_decimal64_scalar_get_value(GArrowDecimal64Scalar *scalar);