diff --git a/websocketpp/frame.hpp b/websocketpp/frame.hpp
index 32b50a64fc..85792cfa20 100644
--- a/websocketpp/frame.hpp
+++ b/websocketpp/frame.hpp
@@ -456,35 +456,6 @@ inline size_t get_header_len(basic_header const & h) {
     return size;
 }
 
-/// Set the frame's size
-/**
- * @param [out] h The basic header to set.
- * @param [out] eh The extended header to set.
- * @param [in] The size to set.
- * @return What error occurred, if any.
- */
-inline lib::error_code set_size(basic_header & h, extended_header & eh, uint64_t
-    size)
-{
-    // make sure value isn't too big
-    uint8_t basic_value;
-
-    if (size <= limits::payload_size_basic) {
-        basic_value = static_cast<uint8_t>(size);
-    } else if (size <= limits::payload_size_extended) {
-        basic_value = payload_size_code_16bit;
-    } else if (size <= limits::payload_size_jumbo) {
-        basic_value = payload_size_code_64bit;
-    } else {
-        // error
-        return lib::error_code();
-    }
-
-    h.b1 = (basic_value & BHB1_PAYLOAD) | (h.b1 & BHB1_MASK);
-
-    return lib::error_code();
-}
-
 /// Calculate the offset location of the masking key within the extended header
 /**
  * Calculate the offset location of the masking key within the extended header