diff --git a/include/bx/math.h b/include/bx/math.h
index f606392..ab133d1 100644
--- a/include/bx/math.h
+++ b/include/bx/math.h
@@ -57,7 +57,7 @@ namespace bx
 		Vec3();
 
 		///
-		constexpr Vec3(float _v);
+		explicit constexpr Vec3(float _v);
 
 		///
 		constexpr Vec3(float _x, float _y, float _z);