diff --git a/src/include/units/quantity.h b/src/include/units/quantity.h
index bc3c3bdf..9e92cf57 100644
--- a/src/include/units/quantity.h
+++ b/src/include/units/quantity.h
@@ -140,16 +140,16 @@ public:
   }
 
   template<typename T = Rep>
-    requires requires(T v) { { v++ } -> SAME_AS(T); }
   [[nodiscard]] constexpr quantity operator++(int)
+    requires requires(T v) { { v++ } -> SAME_AS(T); }
   // requires requires(rep v) { { v++ } -> std::same_as<rep>; }  // TODO gated by gcc-9 (fixed in gcc-10)
   {
     return quantity(value_++);
   }
 
   template<typename T = Rep>
-    requires requires(T v) { { --v } -> SAME_AS(T&); }
   constexpr quantity& operator--()
+    requires requires(T v) { { --v } -> SAME_AS(T&); }
   // requires requires(rep v) { { --v } -> std::same_as<rep&>; }  // TODO gated by gcc-9 (fixed in gcc-10)
   {
     --value_;
@@ -157,8 +157,8 @@ public:
   }
 
   template<typename T = Rep>
-    requires requires(T v) { { v-- } -> SAME_AS(T); }
   [[nodiscard]] constexpr quantity operator--(int)
+    requires requires(T v) { { v-- } -> SAME_AS(T); }
   // requires requires(rep v) { { v-- } -> std::same_as<rep>; }  // TODO gated by gcc-9 (fixed in gcc-10)
   {
     return quantity(value_--);
diff --git a/src/include/units/quantity_point.h b/src/include/units/quantity_point.h
index 795148c5..e0ef8573 100644
--- a/src/include/units/quantity_point.h
+++ b/src/include/units/quantity_point.h
@@ -91,8 +91,8 @@ public:
   }
 
   template<typename Q = quantity_type>
-    requires requires(Q q) { q++; }
   [[nodiscard]] constexpr quantity_point operator++(int)
+    requires requires(Q q) { q++; }
   // requires requires(quantity_type q) { q++; }  // TODO gated by gcc-9 (fixed in gcc-10)
   {
     return quantity_point(q_++);
@@ -108,8 +108,8 @@ public:
   }
 
   template<typename Q = quantity_type>
-    requires requires(Q q) { q--; }
   [[nodiscard]] constexpr quantity_point operator--(int)
+    requires requires(Q q) { q--; }
   // requires requires(quantity_type q) { q--; }  // TODO gated by gcc-9 (fixed in gcc-10)
   {
     return quantity_point(q_--);