diff --git a/compiler/src/dmd/parse.d b/compiler/src/dmd/parse.d
index bb2411825fae..5b73da1b976c 100644
--- a/compiler/src/dmd/parse.d
+++ b/compiler/src/dmd/parse.d
@@ -2974,7 +2974,7 @@ class Parser(AST, Lexer = dmd.lexer.Lexer) : Lexer
                         const tv = peekNext();
                         Loc loc;
                         if (tpl && token.value == TOK.identifier &&
-                            (tv == TOK.comma || tv == TOK.rightParenthesis || tv == TOK.dotDotDot))
+                            (tv == TOK.comma || tv == TOK.rightParenthesis || tv == TOK.dotDotDot || tv == TOK.assign))
                         {
                             Identifier id = Identifier.generateId("__T");
                             loc = token.loc;
diff --git a/compiler/test/runnable/lambdadefault.d b/compiler/test/runnable/lambdadefault.d
new file mode 100644
index 000000000000..f97971c45219
--- /dev/null
+++ b/compiler/test/runnable/lambdadefault.d
@@ -0,0 +1,5 @@
+alias fp = (x = 0) => x;
+static assert(is(typeof(fp!int) : int function(int = 0)));
+static assert(fp() == 0);
+
+int main() {}