diff --git a/CHANGELOG b/CHANGELOG
index 70e31110a2..0e55c722b2 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -18,6 +18,7 @@ git-annex (6.20180317) UNRELEASED; urgency=medium
     stat when run on a directory.
   * info: Changed sorting of numcopies stats table, so it's ordered
     by the variance from the desired number of copies.
+  * Fix resuming a download when using curl.
 
  -- Joey Hess <id@joeyh.name>  Mon, 19 Mar 2018 23:13:59 -0400
 
diff --git a/Utility/Url.hs b/Utility/Url.hs
index 079f21567c..38e3d61b2f 100644
--- a/Utility/Url.hs
+++ b/Utility/Url.hs
@@ -295,7 +295,8 @@ download' quiet url file uo = do
 	curl = do
 		-- curl does not create destination file
 		-- if the url happens to be empty, so pre-create.
-		writeFile file ""
+		unlessM (doesFileExist file) $
+			writeFile file ""
 		go "curl" $ headerparams ++ quietopt "-sS" ++
 			[ Param "-f"
 			, Param "-L"