diff --git a/include/boost/core/lightweight_test.hpp b/include/boost/core/lightweight_test.hpp
index c09ce87..43baea0 100644
--- a/include/boost/core/lightweight_test.hpp
+++ b/include/boost/core/lightweight_test.hpp
@@ -153,6 +153,7 @@ inline void no_throw_failed_impl(const char* expr, const char* what, const char*
 #elif defined(__GNUC__) && !(defined(__INTEL_COMPILER) || defined(__ICL) || defined(__ICC) || defined(__ECC)) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 406
 # pragma GCC diagnostic push
 # pragma GCC diagnostic ignored "-Wsign-compare"
+# pragma GCC diagnostic ignored "-Wsign-conversion"
 #endif
 
 // specialize test output for char pointers to avoid printing as cstring