diff --git a/src/core/include/mp-units/framework/unit.h b/src/core/include/mp-units/framework/unit.h
index 1a8a69c7..e2140b06 100644
--- a/src/core/include/mp-units/framework/unit.h
+++ b/src/core/include/mp-units/framework/unit.h
@@ -756,10 +756,6 @@ constexpr bool space_before_unit_symbol = true;
 
 template<>
 MP_UNITS_INLINE constexpr bool space_before_unit_symbol<one> = false;
-template<>
-MP_UNITS_INLINE constexpr bool space_before_unit_symbol<percent> = false;
-template<>
-MP_UNITS_INLINE constexpr bool space_before_unit_symbol<per_mille> = false;
 
 // get_unit_symbol
 
diff --git a/test/runtime/fmt_test.cpp b/test/runtime/fmt_test.cpp
index 5cf76786..a299d14a 100644
--- a/test/runtime/fmt_test.cpp
+++ b/test/runtime/fmt_test.cpp
@@ -252,9 +252,7 @@ TEST_CASE("operator<< on a quantity", "[text][ostream][fmt]")
       constexpr auto q = value_cast<percent>(15. * isq::length[m] / (100. * isq::length[m]));
       os << q;
 
-      static_assert(!space_before_unit_symbol<get_unit(q.reference)>);
-
-      SECTION("iostream") { CHECK(os.str() == "15%"); }
+      SECTION("iostream") { CHECK(os.str() == "15 %"); }
 
       SECTION("fmt with default format {} on a quantity") { CHECK(MP_UNITS_STD_FMT::format("{}", q) == os.str()); }