diff --git a/include/tao/pegtl/internal/has_current_position.hpp b/include/tao/pegtl/internal/has_current_position.hpp
index 3558ceb14..d1ef5e44c 100644
--- a/include/tao/pegtl/internal/has_current_position.hpp
+++ b/include/tao/pegtl/internal/has_current_position.hpp
@@ -15,7 +15,9 @@ namespace TAO_PEGTL_NAMESPACE::internal
    inline constexpr bool has_current_position = false;
 
    template< typename C >
-   inline constexpr bool has_current_position< C, decltype( std::declval< C >().current_position(), void() ) > = true;
+   inline constexpr bool has_current_position< C, decltype( (void)std::declval< C >().current_position(), void() ) > = true;
+
+   // The (void) is to shut up a warning from GCC 9 and 10 about the return value of the nodiscard-function current_position() being ignored.
 
 }  // namespace TAO_PEGTL_NAMESPACE::internal