diff --git a/esphome/cpp_generator.py b/esphome/cpp_generator.py
index c1e4a87179..09b542b3cc 100644
--- a/esphome/cpp_generator.py
+++ b/esphome/cpp_generator.py
@@ -250,7 +250,7 @@ class FloatLiteral(Literal):
     def __str__(self):
         if math.isnan(self.float_):
             return u"NAN"
-        return u"{:f}f".format(self.float_)
+        return u"{}f".format(self.float_)
 
 
 # pylint: disable=bad-continuation