diff --git a/unit/internal/depth.cpp b/unit/internal/depth.cpp
index 726aa92c..785b3e46 100644
--- a/unit/internal/depth.cpp
+++ b/unit/internal/depth.cpp
@@ -68,8 +68,10 @@ TEST(depth, ctor) {
 }
 
 TEST(depth, convert_throw) {
-    ASSERT_THROW(u32 v = depth::infinity(), DepthOverflowError);
-    ASSERT_THROW(u32 v = depth::unreachable(), DepthOverflowError);
+    u32 v;
+    (void)v;
+    ASSERT_THROW(v = depth::infinity(), DepthOverflowError);
+    ASSERT_THROW(v = depth::unreachable(), DepthOverflowError);
 }
 
 TEST(depth, is_finite) {