diff --git a/Source/Connection/Functions/Function.swift b/Source/Connection/Functions/Function.swift
index c65f07f..95d1927 100644
--- a/Source/Connection/Functions/Function.swift
+++ b/Source/Connection/Functions/Function.swift
@@ -360,7 +360,7 @@ extension Connection {
                 let text = bindingDateFormatter.string(from: date)
                 sqlite3_result_text64(context, text, UInt64(text.utf8.count), SQLITE_TRANSIENT, UInt8(SQLITE_UTF8))
 
-            case .data(var data):
+            case .data(let data):
                     data.withUnsafeBytes {
                         sqlite3_result_blob64(context, $0.bindMemory(to: UInt8.self).baseAddress, UInt64(data.count), SQLITE_TRANSIENT)
                     }