diff --git a/lib/std/core/str.c3 b/lib/std/core/str.c3
index c12d2ae75..7e99ec541 100644
--- a/lib/std/core/str.c3
+++ b/lib/std/core/str.c3
@@ -306,7 +306,7 @@ fn String utf32to8(Char32[] utf32, Allocator* allocator = mem::current_allocator
 	return data[:len];
 }
 
-fn Char16[]! utf8to16(String utf8, Allocator* allocator = mem::current_allocator)
+fn Char16[]! utf8to16(String utf8, Allocator* allocator = mem::current_allocator())
 {
 	usz len16 = conv::utf16len_for_utf8(utf8);
 	Char16* data = allocator.alloc((len16 + 1) * Char16.sizeof)?;
diff --git a/src/version.h b/src/version.h
index e1c4d1944..43cf87680 100644
--- a/src/version.h
+++ b/src/version.h
@@ -1 +1 @@
-#define COMPILER_VERSION "0.4.19"
\ No newline at end of file
+#define COMPILER_VERSION "0.4.20"
\ No newline at end of file