diff --git a/toolchain/check/sem_ir_loc_diagnostic_emitter.cpp b/toolchain/check/sem_ir_loc_diagnostic_emitter.cpp
index d2c6c57df710d..dc24be71112bf 100644
--- a/toolchain/check/sem_ir_loc_diagnostic_emitter.cpp
+++ b/toolchain/check/sem_ir_loc_diagnostic_emitter.cpp
@@ -57,11 +57,11 @@ auto SemIRLocDiagnosticEmitter::ConvertLocImpl(SemIRLoc loc,
   return ConvertLocInFile(final_node_id, loc.token_only_, context_fn);
 }
 
-auto SemIRDiagnosticConverter::ConvertLocInFile(
+auto SemIRLocDiagnosticEmitter::ConvertLocInFile(
     SemIR::AbsoluteNodeId absolute_node_id, bool token_only,
     ContextFnT /*context_fn*/) const -> ConvertedDiagnosticLoc {
   const auto& tree_and_subtrees =
-      imported_trees_and_subtrees_[absolute_node_id.check_ir_id.index]();
+      tree_and_subtrees_getters_[absolute_node_id.check_ir_id.index]();
   return tree_and_subtrees.NodeToDiagnosticLoc(absolute_node_id.node_id,
                                                token_only);
 }
diff --git a/toolchain/lower/BUILD b/toolchain/lower/BUILD
index c5c75486683bd..85fba95be5526 100644
--- a/toolchain/lower/BUILD
+++ b/toolchain/lower/BUILD
@@ -51,6 +51,7 @@ cc_library(
         "//common:vlog",
         "//toolchain/base:kind_switch",
         "//toolchain/check:sem_ir_diagnostic_converter",
+        "//toolchain/check:sem_ir_loc_diagnostic_emitter",
         "//toolchain/sem_ir:absolute_node_id",
         "//toolchain/sem_ir:entry_point",
         "//toolchain/sem_ir:file",