diff --git a/tests/test-dirs/with-ppx/dune b/tests/test-dirs/with-ppx/dune
index f29d480b73..5a55c21031 100644
--- a/tests/test-dirs/with-ppx/dune
+++ b/tests/test-dirs/with-ppx/dune
@@ -3,5 +3,5 @@
  (locks ../server-tests/merlin_server))
 
 (cram
- (applies_to issue1660-deriving-compare)
+ (applies_to issue1660-deriving-compare issue1671-string)
  (enabled_if (= %{env:MERLIN_TESTS=default} all)))
diff --git a/tests/test-dirs/with-ppx/issue1671-string.t b/tests/test-dirs/with-ppx/issue1671-string.t
new file mode 100644
index 0000000000..46d347b6b3
--- /dev/null
+++ b/tests/test-dirs/with-ppx/issue1671-string.t
@@ -0,0 +1,124 @@
+  $ cat >dune-project <<EOF
+  > (lang dune 2.0)
+  > EOF
+
+  $ cat >main.ml <<EOF
+  > let f x =
+  >   [%string
+  >     "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa \
+  >      %{x}"]
+  > ;;
+  > print_endline @@ f "42";;
+  > EOF
+
+  $ cat >dune <<EOF
+  > (executable
+  >  (name main)
+  >  (preprocess (pps ppx_string)))
+
+  $ dune build @check 
+
+  $ dune exec ./main.exe
+  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa      42
+
+FIX upstream: locs issued by the ppx does not enable Merlin to work as expected
+  $ $MERLIN single type-enclosing -position 3:7 \
+  > -filename main.ml <main.ml
+  {
+    "class": "return",
+    "value": [
+      {
+        "start": {
+          "line": 1,
+          "col": 6
+        },
+        "end": {
+          "line": 3,
+          "col": 97
+        },
+        "type": "string -> string",
+        "tail": "no"
+      }
+    ],
+    "notifications": []
+  }
+
+FIXME: Merlin should ignore hidden nodes in occurrences results to prevent
+broken renaming
+  $ $MERLIN single occurrences -identifier-at 1:6 \
+  > -filename main.ml <main.ml
+
+  $ $MERLIN single dump -what typedtree -filename main.ml <main.ml
+  {
+    "class": "return",
+    "value": "[
+    structure_item (main.ml[1,0+0]..main.ml[3,21+97])
+      Tstr_value Nonrec
+      [
+        <def>
+          pattern (main.ml[1,0+4]..main.ml[1,0+5])
+            Tpat_var \"f/273\"
+          expression (main.ml[1,0+6]..main.ml[3,21+97]) ghost
+            Texp_function
+            Nolabel
+            [
+              <case>
+                pattern (main.ml[1,0+6]..main.ml[1,0+7])
+                  Tpat_var \"x/275\"
+                expression (main.ml[2,10+2]..main.ml[3,21+97])
+                  attribute \"merlin.hide\"
+                    []
+                  Texp_apply
+                  expression (main.ml[2,10+2]..main.ml[3,21+97])
+                    Texp_ident \"Stdlib!.String.concat\"
+                  [
+                    <arg>
+                      Nolabel
+                      expression (main.ml[2,10+2]..main.ml[3,21+97])
+                        Texp_constant Const_string(\"\",(main.ml[2,10+2]..main.ml[3,21+97]),None)
+                    <arg>
+                      Nolabel
+                      expression (main.ml[2,10+2]..main.ml[3,21+97])
+                        Texp_construct \"::\"
+                        [
+                          expression (main.ml[3,21+5]..main.ml[3,21+91]) ghost
+                            Texp_constant Const_string(\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa      \",(main.ml[3,21+5]..main.ml[3,21+91]) ghost,None)
+                          expression (main.ml[2,10+2]..main.ml[3,21+97])
+                            Texp_construct \"::\"
+                            [
+                              expression (main.ml[3,21+93]..main.ml[3,21+94])
+                                Texp_ident \"x/275\"
+                              expression (main.ml[2,10+2]..main.ml[3,21+97])
+                                Texp_construct \"[]\"
+                                []
+                            ]
+                        ]
+                  ]
+            ]
+      ]
+    structure_item (main.ml[5,122+0]..main.ml[5,122+23])
+      Tstr_eval
+      expression (main.ml[5,122+0]..main.ml[5,122+23])
+        Texp_apply
+        expression (main.ml[5,122+0]..main.ml[5,122+13])
+          Texp_ident \"Stdlib!.print_endline\"
+        [
+          <arg>
+            Nolabel
+            expression (main.ml[5,122+17]..main.ml[5,122+23])
+              Texp_apply
+              expression (main.ml[5,122+17]..main.ml[5,122+18])
+                Texp_ident \"f/273\"
+              [
+                <arg>
+                  Nolabel
+                  expression (main.ml[5,122+19]..main.ml[5,122+23])
+                    Texp_constant Const_string(\"42\",(main.ml[5,122+20]..main.ml[5,122+22]),None)
+              ]
+        ]
+  ]
+  
+  
+  ",
+    "notifications": []
+  }