diff --git a/HISTORY.rst b/HISTORY.rst
index 10a5dcf0..6878132b 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -25,6 +25,8 @@ PlatformIO 3.0
 * Removed "date&time" when processing project with `platformio run <http://docs.platformio.org/page/userguide/cmd_run.html>`__ command
   (`issue #1343 <https://github.com/platformio/platformio-core/issues/1343>`_)
 * Fixed issue with invalid LD script if path contains space
+* Fixed preprocessor for Arduino sketch when function returns certain type
+  (`issue #1683 <https://github.com/platformio/platformio-core/issues/1683>`_)
 
 3.5.3 (2018-06-01)
 ~~~~~~~~~~~~~~~~~~
diff --git a/platformio/builder/tools/piomisc.py b/platformio/builder/tools/piomisc.py
index 4ac533cf..c15812c3 100644
--- a/platformio/builder/tools/piomisc.py
+++ b/platformio/builder/tools/piomisc.py
@@ -33,7 +33,7 @@ class InoToCPPConverter(object):
     PROTOTYPE_RE = re.compile(
         r"""^(
         (?:template\<.*\>\s*)?      # template
-        ([a-z_\d]+\*?\s+){1,2}      # return type
+        ([a-z_\d\&]+\*?\s+){1,2}      # return type
         ([a-z_\d]+\s*)              # name of prototype
         \([a-z_,\.\*\&\[\]\s\d]*\)  # arguments
         )\s*\{                      # must end with {