diff --git a/src/libstore/builtins/fetchurl.cc b/src/libstore/builtins/fetchurl.cc
index 92aec63a..b1af3b4f 100644
--- a/src/libstore/builtins/fetchurl.cc
+++ b/src/libstore/builtins/fetchurl.cc
@@ -64,7 +64,8 @@ void builtinFetchurl(const BasicDerivation & drv, const std::string & netrcData)
             try {
                 if (!hasSuffix(hashedMirror, "/")) hashedMirror += '/';
                 auto ht = parseHashType(getAttr("outputHashAlgo"));
-                fetch(hashedMirror + printHashType(ht) + "/" + Hash(getAttr("outputHash"), ht).to_string(Base16, false));
+                auto h = Hash(getAttr("outputHash"), ht);
+                fetch(hashedMirror + printHashType(h.type) + "/" + h.to_string(Base16, false));
                 return;
             } catch (Error & e) {
                 debug(e.what());
diff --git a/tests/fetchurl.sh b/tests/fetchurl.sh
index ec3399b0..7319ced2 100644
--- a/tests/fetchurl.sh
+++ b/tests/fetchurl.sh
@@ -42,6 +42,10 @@ ln -s $(pwd)/fetchurl.sh $mirror/sha512/$hash32
 
 outPath=$(nix-build '<nix/fetchurl.nix>' --argstr url file:///no-such-dir/fetchurl.sh --argstr sha512 $hash --no-out-link --hashed-mirrors "file://$mirror")
 
+# Test hashed mirrors with an SRI hash.
+nix-build '<nix/fetchurl.nix>' --argstr url file:///no-such-dir/fetchurl.sh --argstr hash $(nix to-sri --type sha512 $hash) \
+          --argstr name bla --no-out-link --hashed-mirrors "file://$mirror"
+
 # Test unpacking a NAR.
 rm -rf $TEST_ROOT/archive
 mkdir -p $TEST_ROOT/archive