diff --git a/lib/coffeescript/lexer.js b/lib/coffeescript/lexer.js
index b00e651c40..c200453457 100644
--- a/lib/coffeescript/lexer.js
+++ b/lib/coffeescript/lexer.js
@@ -1806,10 +1806,11 @@
   // Is this an attribute with a value?
 }(?:\\s*:\\s*${JSX_IDENTIFIER_PART})?)([^\\S]*=(?!=))?`);
 
-  NUMBER = /^0b[01](?:_?[01])*n?|^0o[0-7](?:_?[0-7])*n?|^0x[\da-f](?:_?[\da-f])*n?|^\d+(?:_\d+)*n|^(?:\d+(?:_\d+)*)?\.?\d+(?:_\d+)*(?:e[+-]?\d+(?:_\d+)*)?/i; // binary
+  NUMBER = /^0b[01](?:_?[01])*n?|^0o[0-7](?:_?[0-7])*n?|^0x[\da-f](?:_?[\da-f])*n?|^\d+(?:_\d+)*n|^\d+(?:_\d+)*\.e[+-]?\d+(?:_\d+)*|^(?:\d+(?:_\d+)*)?\.?\d+(?:_\d+)*(?:e[+-]?\d+(?:_\d+)*)?/i; // binary
   // octal
   // hex
   // decimal bigint
+  // decimal with exponent and no fractional digits
   // decimal
   // decimal without support for numeric literal separators for reference:
   // \d*\.?\d+ (?:e[+-]?\d+)?
diff --git a/src/lexer.coffee b/src/lexer.coffee
index 80135b9db5..0b4087b0c7 100644
--- a/src/lexer.coffee
+++ b/src/lexer.coffee
@@ -1311,6 +1311,7 @@ NUMBER     = ///
   ^ 0o[0-7](?:_?[0-7])*n?                       | # octal
   ^ 0x[\da-f](?:_?[\da-f])*n?                   | # hex
   ^ \d+(?:_\d+)*n                               | # decimal bigint
+  ^ \d+(?:_\d+)* \. e[+-]? \d+(?:_\d+)*        | # decimal with exponent and no fractional digits
   ^ (?:\d+(?:_\d+)*)?      \.? \d+(?:_\d+)*       # decimal
                      (?:e[+-]? \d+(?:_\d+)* )?
   # decimal without support for numeric literal separators for reference:
diff --git a/test/numbers.coffee b/test/numbers.coffee
index 04a83cb846..72b0ca39be 100644
--- a/test/numbers.coffee
+++ b/test/numbers.coffee
@@ -77,6 +77,10 @@ test "#5164: Allow lowercase and uppercase exponent notation", ->
   doesNotThrow -> CoffeeScript.compile "0e0", bare: yes
   doesNotThrow -> CoffeeScript.compile "0E0", bare: yes
 
+test "#5469: Allow a trailing decimal point before an exponent", ->
+  eq 10, CoffeeScript.eval "1.e1"
+  eq 0.1, CoffeeScript.eval "1.e-1"
+
 test "#2224: hex literals with 0b or B or E", ->
   eq 176, 0x0b0
   eq 177, 0x0B1