diff --git a/Foundation/NSData.swift b/Foundation/NSData.swift
index 04e7f82ee5..b6e3d4c8be 100644
--- a/Foundation/NSData.swift
+++ b/Foundation/NSData.swift
@@ -406,6 +406,7 @@ open class NSData : NSObject, NSCopying, NSMutableCopying, NSSecureCoding {
         }
 
         if remaining != 0 {
+            free(data)
             throw NSError(domain: NSPOSIXErrorDomain, code: Int(errno), userInfo: nil)
         }