diff --git a/src/include/units/bits/external/fixed_string.h b/src/include/units/bits/external/fixed_string.h
index ea8d9f5e..c3787cf8 100644
--- a/src/include/units/bits/external/fixed_string.h
+++ b/src/include/units/bits/external/fixed_string.h
@@ -60,7 +60,7 @@ struct basic_fixed_string {
     for (size_t i = 0; i != N; ++i) txt[i] = lhs[i];
     for (size_t i = 0; i != N2; ++i) txt[N + i] = rhs[i];
 
-    return units::basic_fixed_string<CharT, N + N2>(txt);
+    return basic_fixed_string<CharT, N + N2>(txt);
   }
 
 #if __GNUC__ >= 10