diff --git a/parse.y b/parse.y
index 067f45e6d6..03dd1c6f92 100644
--- a/parse.y
+++ b/parse.y
@@ -5149,7 +5149,7 @@ lambda		: tLAMBDA[lpar]
                         CMDARG_POP();
                         $args = args_with_numbered(p, $args, max_numparam, it_id);
                         {
-                            YYLTYPE loc = code_loc_gen(&@args, &@body);
+                            YYLTYPE loc = code_loc_gen(&@lpar, &@body);
                             $$ = NEW_LAMBDA($args, $body->node, &loc, &@lpar, &$body->opening_loc, &$body->closing_loc);
                             nd_set_line(RNODE_LAMBDA($$)->nd_body, @body.end_pos.lineno);
                             nd_set_line($$, @args.end_pos.lineno);
diff --git a/prism_compile.c b/prism_compile.c
index 77b940ce6c..36a0b6ce50 100644
--- a/prism_compile.c
+++ b/prism_compile.c
@@ -3284,13 +3284,6 @@ pm_scope_node_init(const pm_node_t *node, pm_scope_node_t *scope, pm_scope_node_
         scope->parameters = cast->parameters;
         scope->body = cast->body;
         scope->locals = cast->locals;
-
-        if (cast->parameters != NULL) {
-            scope->base.location.start = cast->parameters->location.start;
-        }
-        else {
-            scope->base.location.start = cast->operator_loc.end;
-        }
         break;
       }
       case PM_MODULE_NODE: {
diff --git a/spec/ruby/core/proc/source_location_spec.rb b/spec/ruby/core/proc/source_location_spec.rb
index 69b4e2fd82..18f1ca274c 100644
--- a/spec/ruby/core/proc/source_location_spec.rb
+++ b/spec/ruby/core/proc/source_location_spec.rb
@@ -61,7 +61,7 @@ describe "Proc#source_location" do
     ruby_version_is("4.0") do
       proc { true }.source_location.should == [__FILE__, __LINE__, 11, __LINE__, 19]
       Proc.new { true }.source_location.should == [__FILE__, __LINE__, 15, __LINE__, 23]
-      -> { true }.source_location.should == [__FILE__, __LINE__, 8, __LINE__, 17]
+      -> { true }.source_location.should == [__FILE__, __LINE__, 6, __LINE__, 17]
     end
   end
 
@@ -98,7 +98,7 @@ describe "Proc#source_location" do
       location.should == ["foo", 100]
     end
     ruby_version_is("4.0") do
-      location.should == ["foo", 100, 2, 100, 5]
+      location.should == ["foo", 100, 0, 100, 5]
     end
   end
 end
diff --git a/test/ruby/test_ast.rb b/test/ruby/test_ast.rb
index c7a946dec8..22ccbfb604 100644
--- a/test/ruby/test_ast.rb
+++ b/test/ruby/test_ast.rb
@@ -1230,7 +1230,7 @@ dummy
        args: nil
        body:
          (LAMBDA@1:0-2:3
-            (SCOPE@1:2-2:3
+            (SCOPE@1:0-2:3
              tbl: []
              args:
                (ARGS@1:2-1:2
diff --git a/test/ruby/test_lambda.rb b/test/ruby/test_lambda.rb
index 3cbb54306c..6a0dd9915e 100644
--- a/test/ruby/test_lambda.rb
+++ b/test/ruby/test_lambda.rb
@@ -276,7 +276,7 @@ class TestLambdaParameters < Test::Unit::TestCase
   end
 
   def test_do_lambda_source_location
-    exp = [__LINE__ + 1, 12, __LINE__ + 5, 7]
+    exp = [__LINE__ + 1, 10, __LINE__ + 5, 7]
     lmd = ->(x,
              y,
              z) do
@@ -288,7 +288,7 @@ class TestLambdaParameters < Test::Unit::TestCase
   end
 
   def test_brace_lambda_source_location
-    exp = [__LINE__ + 1, 12, __LINE__ + 5, 5]
+    exp = [__LINE__ + 1, 10, __LINE__ + 5, 5]
     lmd = ->(x,
              y,
              z) {