diff --git a/glm/core/func_exponential.inl b/glm/core/func_exponential.inl
index 7738df02..1524b63e 100644
--- a/glm/core/func_exponential.inl
+++ b/glm/core/func_exponential.inl
@@ -146,6 +146,8 @@ namespace detail
 			std::numeric_limits<genType>::is_iec559,
 			"'sqrt' only accept floating-point inputs");
 
+		assert(x >= genType(0));
+
 		return std::sqrt(x);
 	}