diff --git a/src/libsyntax/json.rs b/src/libsyntax/json.rs
index 909b0031d6150..695c740f4052b 100644
--- a/src/libsyntax/json.rs
+++ b/src/libsyntax/json.rs
@@ -256,8 +256,8 @@ impl DiagnosticSpan {
         });
         DiagnosticSpan {
             file_name: start.file.name.clone(),
-            byte_start: span.lo.0,
-            byte_end: span.hi.0,
+            byte_start: span.lo.0 - start.file.start_pos.0,
+            byte_end: span.hi.0 - start.file.start_pos.0,
             line_start: start.line,
             line_end: end.line,
             column_start: start.col.0 + 1,
@@ -362,4 +362,3 @@ impl JsonEmitter {
         suggestion.splice_lines(&*self.cm).iter().map(|line| line.0.to_owned()).collect()
     }
 }
-
diff --git a/src/test/run-make/issue-35164/Makefile b/src/test/run-make/issue-35164/Makefile
new file mode 100644
index 0000000000000..c7bc26e3f5a9e
--- /dev/null
+++ b/src/test/run-make/issue-35164/Makefile
@@ -0,0 +1,4 @@
+-include ../tools.mk
+
+all:
+	$(RUSTC) main.rs --error-format json 2>&1 | grep -q '"byte_start":490.*"byte_end":496'
diff --git a/src/test/run-make/issue-35164/main.rs b/src/test/run-make/issue-35164/main.rs
new file mode 100644
index 0000000000000..24322a2484fe0
--- /dev/null
+++ b/src/test/run-make/issue-35164/main.rs
@@ -0,0 +1,15 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+mod submodule;
+
+fn main() {
+    submodule::foo();
+}
diff --git a/src/test/run-make/issue-35164/submodule/mod.rs b/src/test/run-make/issue-35164/submodule/mod.rs
new file mode 100644
index 0000000000000..7847c13af787d
--- /dev/null
+++ b/src/test/run-make/issue-35164/submodule/mod.rs
@@ -0,0 +1,13 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+pub fn foo() {
+    let _MyFoo = 2;
+}