diff --git a/example/include/ranged_representation.h b/example/include/ranged_representation.h
index 335f22dd6..aa5eb7256 100644
--- a/example/include/ranged_representation.h
+++ b/example/include/ranged_representation.h
@@ -42,7 +42,7 @@ import mp_units.core;
 
 template<std::movable T, MP_UNITS_CONSTRAINED_NTTP_WORKAROUND(std::convertible_to<T>) auto Min,
          MP_UNITS_CONSTRAINED_NTTP_WORKAROUND(std::convertible_to<T>) auto Max>
-constexpr auto is_in_range = [](const auto& v) { return std::clamp(v, T{Min}, T{Max}) == v; };
+MP_UNITS_INLINE constexpr auto is_in_range = [](const auto& v) { return std::clamp(v, T{Min}, T{Max}) == v; };
 
 template<std::movable T, MP_UNITS_CONSTRAINED_NTTP_WORKAROUND(std::convertible_to<T>) auto Min,
          MP_UNITS_CONSTRAINED_NTTP_WORKAROUND(std::convertible_to<T>) auto Max>
diff --git a/src/core/include/mp-units/bits/hacks.h b/src/core/include/mp-units/bits/hacks.h
index 5030debb7..6dbba51bf 100644
--- a/src/core/include/mp-units/bits/hacks.h
+++ b/src/core/include/mp-units/bits/hacks.h
@@ -77,6 +77,9 @@
 #define MP_UNITS_HOSTED __STDC_HOSTED__
 #endif
 
+// workarounds for https://cplusplus.github.io/CWG/issues/2387.html
+#define MP_UNITS_INLINE inline
+
 #if MP_UNITS_COMP_MSVC
 
 #define MP_UNITS_TYPENAME typename
diff --git a/src/core/include/mp-units/bits/text_tools.h b/src/core/include/mp-units/bits/text_tools.h
index dc5bfed3f..0b1fa7f71 100644
--- a/src/core/include/mp-units/bits/text_tools.h
+++ b/src/core/include/mp-units/bits/text_tools.h
@@ -43,25 +43,25 @@ template<std::intmax_t Value>
 constexpr basic_fixed_string superscript_number = u8"";
 
 template<>
-constexpr basic_fixed_string superscript_number<0> = u8"\u2070";
+MP_UNITS_INLINE constexpr basic_fixed_string superscript_number<0> = u8"\u2070";
 template<>
-constexpr basic_fixed_string superscript_number<1> = u8"\u00b9";
+MP_UNITS_INLINE constexpr basic_fixed_string superscript_number<1> = u8"\u00b9";
 template<>
-constexpr basic_fixed_string superscript_number<2> = u8"\u00b2";
+MP_UNITS_INLINE constexpr basic_fixed_string superscript_number<2> = u8"\u00b2";
 template<>
-constexpr basic_fixed_string superscript_number<3> = u8"\u00b3";
+MP_UNITS_INLINE constexpr basic_fixed_string superscript_number<3> = u8"\u00b3";
 template<>
-constexpr basic_fixed_string superscript_number<4> = u8"\u2074";
+MP_UNITS_INLINE constexpr basic_fixed_string superscript_number<4> = u8"\u2074";
 template<>
-constexpr basic_fixed_string superscript_number<5> = u8"\u2075";
+MP_UNITS_INLINE constexpr basic_fixed_string superscript_number<5> = u8"\u2075";
 template<>
-constexpr basic_fixed_string superscript_number<6> = u8"\u2076";
+MP_UNITS_INLINE constexpr basic_fixed_string superscript_number<6> = u8"\u2076";
 template<>
-constexpr basic_fixed_string superscript_number<7> = u8"\u2077";
+MP_UNITS_INLINE constexpr basic_fixed_string superscript_number<7> = u8"\u2077";
 template<>
-constexpr basic_fixed_string superscript_number<8> = u8"\u2078";
+MP_UNITS_INLINE constexpr basic_fixed_string superscript_number<8> = u8"\u2078";
 template<>
-constexpr basic_fixed_string superscript_number<9> = u8"\u2079";
+MP_UNITS_INLINE constexpr basic_fixed_string superscript_number<9> = u8"\u2079";
 
 inline constexpr symbol_text superscript_minus(u8"\u207b", "-");
 
diff --git a/src/core/include/mp-units/framework/expression_template.h b/src/core/include/mp-units/framework/expression_template.h
index 51522f58b..fe64b2277 100644
--- a/src/core/include/mp-units/framework/expression_template.h
+++ b/src/core/include/mp-units/framework/expression_template.h
@@ -72,7 +72,7 @@ template<int Num>
 constexpr bool valid_ratio<Num, 0> = false;
 
 template<>
-constexpr bool valid_ratio<0, 0> = false;
+MP_UNITS_INLINE constexpr bool valid_ratio<0, 0> = false;
 
 template<int Num, int... Den>
 constexpr bool positive_ratio = gt_zero<Num>;
@@ -84,7 +84,7 @@ template<int Num, int... Den>
 constexpr bool ratio_one = false;
 
 template<>
-constexpr bool ratio_one<1> = true;
+MP_UNITS_INLINE constexpr bool ratio_one<1> = true;
 
 template<int N>
 constexpr bool ratio_one<N, N> = true;
diff --git a/src/core/include/mp-units/framework/unit.h b/src/core/include/mp-units/framework/unit.h
index 269ef4d03..bc4fd7e02 100644
--- a/src/core/include/mp-units/framework/unit.h
+++ b/src/core/include/mp-units/framework/unit.h
@@ -678,11 +678,11 @@ template<Unit auto U>
 constexpr bool space_before_unit_symbol = true;
 
 template<>
-constexpr bool space_before_unit_symbol<one> = false;
+MP_UNITS_INLINE constexpr bool space_before_unit_symbol<one> = false;
 template<>
-constexpr bool space_before_unit_symbol<percent> = false;
+MP_UNITS_INLINE constexpr bool space_before_unit_symbol<percent> = false;
 template<>
-constexpr bool space_before_unit_symbol<per_mille> = false;
+MP_UNITS_INLINE constexpr bool space_before_unit_symbol<per_mille> = false;
 
 // get_unit_symbol
 
diff --git a/src/systems/include/mp-units/systems/angular/units.h b/src/systems/include/mp-units/systems/angular/units.h
index a8e6e01d6..25709fd95 100644
--- a/src/systems/include/mp-units/systems/angular/units.h
+++ b/src/systems/include/mp-units/systems/angular/units.h
@@ -62,8 +62,8 @@ inline constexpr auto deg2 = square(degree);
 }  // namespace angular
 
 template<>
-constexpr bool space_before_unit_symbol<angular::degree> = false;
+MP_UNITS_INLINE constexpr bool space_before_unit_symbol<angular::degree> = false;
 template<>
-constexpr bool space_before_unit_symbol<angular::gradian> = false;
+MP_UNITS_INLINE constexpr bool space_before_unit_symbol<angular::gradian> = false;
 
 }  // namespace mp_units
diff --git a/src/systems/include/mp-units/systems/si/units.h b/src/systems/include/mp-units/systems/si/units.h
index 856808784..af14f2df4 100644
--- a/src/systems/include/mp-units/systems/si/units.h
+++ b/src/systems/include/mp-units/systems/si/units.h
@@ -126,10 +126,10 @@ using namespace non_si;
 }  // namespace si
 
 template<>
-constexpr bool space_before_unit_symbol<non_si::degree> = false;
+MP_UNITS_INLINE constexpr bool space_before_unit_symbol<non_si::degree> = false;
 template<>
-constexpr bool space_before_unit_symbol<non_si::arcminute> = false;
+MP_UNITS_INLINE constexpr bool space_before_unit_symbol<non_si::arcminute> = false;
 template<>
-constexpr bool space_before_unit_symbol<non_si::arcsecond> = false;
+MP_UNITS_INLINE constexpr bool space_before_unit_symbol<non_si::arcsecond> = false;
 
 }  // namespace mp_units