diff --git a/src/hb-machinery.hh b/src/hb-machinery.hh
index ae34c92f4..19245e89b 100644
--- a/src/hb-machinery.hh
+++ b/src/hb-machinery.hh
@@ -118,7 +118,7 @@ static inline Type& StructAfter(TObject &X)
 
 #define DEFINE_SIZE_ARRAY_SIZED(size, array) \
 	DEFINE_SIZE_ARRAY(size, array); \
-	inline unsigned int get_size (void) const { return (size - array[0].min_size + array.get_size ()); }
+	inline unsigned int get_size (void) const { return (size - array.min_size + array.get_size ()); }
 
 #define DEFINE_SIZE_ARRAY2(size, array1, array2) \
   DEFINE_INSTANCE_ASSERTION (sizeof (*this) == (size) + sizeof (this->array1[0]) + sizeof (this->array2[0])); \