diff --git a/CHANGELOG b/CHANGELOG
index ac90bc51a..7811d957f 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -288,7 +288,7 @@
 
 * 1.42.4 (2019-XX-XX)
 
- * n/a
+ * added supported for exponential numbers
 
 * 1.42.3 (2019-08-24)
 
diff --git a/src/Environment.php b/src/Environment.php
index 610259868..f011cfa20 100644
--- a/src/Environment.php
+++ b/src/Environment.php
@@ -435,7 +435,7 @@ class Environment
      *
      * This method should not be used as a generic way to load templates.
      *
-     * @param string $template The template name
+     * @param string $template The template source
      * @param string $name     An optional name of the template to be used in error messages
      *
      * @return TemplateWrapper A template instance representing the given template name
diff --git a/src/Lexer.php b/src/Lexer.php
index 8bcd0f875..45c729023 100644
--- a/src/Lexer.php
+++ b/src/Lexer.php
@@ -44,7 +44,7 @@ class Lexer
     const STATE_INTERPOLATION = 4;
 
     const REGEX_NAME = '/[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*/A';
-    const REGEX_NUMBER = '/[0-9]+(?:\.[0-9]+)?/A';
+    const REGEX_NUMBER = '/[0-9]+(?:\.[0-9]+)?([Ee][\+\-][0-9]+)?/A';
     const REGEX_STRING = '/"([^#"\\\\]*(?:\\\\.[^#"\\\\]*)*)"|\'([^\'\\\\]*(?:\\\\.[^\'\\\\]*)*)\'/As';
     const REGEX_DQ_STRING_DELIM = '/"/A';
     const REGEX_DQ_STRING_PART = '/[^#"\\\\]*(?:(?:\\\\.|#(?!\{))[^#"\\\\]*)*/As';
diff --git a/tests/Fixtures/expressions/exponential_numbers.test b/tests/Fixtures/expressions/exponential_numbers.test
new file mode 100644
index 000000000..f403110bc
--- /dev/null
+++ b/tests/Fixtures/expressions/exponential_numbers.test
@@ -0,0 +1,8 @@
+--TEST--
+Twig manages exponentiel numbers correctly
+--TEMPLATE--
+{{ 1.99E+3 }}
+--DATA--
+return []
+--EXPECT--
+1990