diff --git a/releasenotes.md b/releasenotes.md
index 833391983..db609263b 100644
--- a/releasenotes.md
+++ b/releasenotes.md
@@ -17,6 +17,7 @@
 - Detect recursive creation of generics #2366.
 - Compiler assertion when defining a function with return type untyped_list #2368.
 - Compiler assert when using generic parameters list without any parameters. #2369
+- Parsing difference between "0x00." and "0X00." literals #2371
 
 ### Stdlib changes
 - Add `==` to `Pair`, `Triple` and TzDateTime. Add print to `Pair` and `Triple`.
diff --git a/src/compiler/parse_expr.c b/src/compiler/parse_expr.c
index cfc6ca869..271d5f0db 100644
--- a/src/compiler/parse_expr.c
+++ b/src/compiler/parse_expr.c
@@ -1883,7 +1883,7 @@ static Expr *parse_double(ParseContext *c, Expr *left, SourceSpan lhs_start)
 	char *err;
 	Expr *number = EXPR_NEW_TOKEN(EXPR_CONST);
 	const char *original = symstr(c);
-	bool is_hex = original[0] == '0' && original[1] == 'x';
+	bool is_hex = original[0] == '0' && (original[1] == 'x' || original[1] == 'X');
 	// This is set to try to print in a similar manner as the input.
 	number->const_expr.is_hex = is_hex;
 	if (c->data.lex_len > 3)
diff --git a/test/test_suite/floats/parse_hex_float.c3 b/test/test_suite/floats/parse_hex_float.c3
new file mode 100644
index 000000000..a1114215a
--- /dev/null
+++ b/test/test_suite/floats/parse_hex_float.c3
@@ -0,0 +1,4 @@
+fn void main()
+{
+	$echo $typeof(0X00.).nameof; // #error: Hex floating points must end with 'p' or 'P'
+}