diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 44a97461a..9cd9fa6f1 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -3456,7 +3456,7 @@ static void prim_concatMap(EvalState & state, const PosIdx pos, Value * * args,
     for (unsigned int n = 0; n < nrLists; ++n) {
         Value * vElem = args[1]->listElems()[n];
         state.callFunction(*args[0], *vElem, lists[n], pos);
-        state.forceList(lists[n], lists[n].determinePos(args[0]->determinePos(pos)), "while evaluating the return value of the function passed to buitlins.concatMap");
+        state.forceList(lists[n], lists[n].determinePos(args[0]->determinePos(pos)), "while evaluating the return value of the function passed to builtins.concatMap");
         len += lists[n].listSize();
     }
 
diff --git a/tests/unit/libexpr/error_traces.cc b/tests/unit/libexpr/error_traces.cc
index 285651256..628e73f25 100644
--- a/tests/unit/libexpr/error_traces.cc
+++ b/tests/unit/libexpr/error_traces.cc
@@ -906,12 +906,12 @@ namespace nix {
         ASSERT_TRACE2("concatMap (x: 1) [ \"foo\" ] # TODO",
                       TypeError,
                       hintfmt("value is %s while a list was expected", "an integer"),
-                      hintfmt("while evaluating the return value of the function passed to buitlins.concatMap"));
+                      hintfmt("while evaluating the return value of the function passed to builtins.concatMap"));
 
         ASSERT_TRACE2("concatMap (x: \"foo\") [ 1 2 ] # TODO",
                       TypeError,
                       hintfmt("value is %s while a list was expected", "a string"),
-                      hintfmt("while evaluating the return value of the function passed to buitlins.concatMap"));
+                      hintfmt("while evaluating the return value of the function passed to builtins.concatMap"));
 
     }