diff --git a/packages/block-library/src/site-logo/style.scss b/packages/block-library/src/site-logo/style.scss
index 07a8f66906a2b3..cf7154bc2dd107 100644
--- a/packages/block-library/src/site-logo/style.scss
+++ b/packages/block-library/src/site-logo/style.scss
@@ -11,6 +11,12 @@
 		height: auto;
 	}
 
+	// Constrain the image to its container.
+	img {
+		height: auto;
+		max-width: 100%;
+	}
+
 	// Inherit border radius from style variations.
 	a,
 	img {