diff --git a/src/Magnum/Text/Test/AbstractGlyphCacheTest.cpp b/src/Magnum/Text/Test/AbstractGlyphCacheTest.cpp
index b3c7007f1..e3e858fbc 100644
--- a/src/Magnum/Text/Test/AbstractGlyphCacheTest.cpp
+++ b/src/Magnum/Text/Test/AbstractGlyphCacheTest.cpp
@@ -143,7 +143,7 @@ void AbstractGlyphCacheTest::reserveIncremental() {
     DummyGlyphCache cache{{24, 20}, {1, 2}};
 
     /* insert() is what triggers the assert, not reserve() alone */
-    cache.insert(0, {3, 5}, {{10, 10}, {23, 45}});
+    cache.insert(34, {3, 5}, {{10, 10}, {23, 10}});
 
     std::ostringstream out;
     Error redirectError{&out};