diff --git a/image/test/fuzzing/TestDecoders.cpp b/image/test/fuzzing/TestDecoders.cpp
index 8515ff43c61c..c5c0dcdb27bc 100644
--- a/image/test/fuzzing/TestDecoders.cpp
+++ b/image/test/fuzzing/TestDecoders.cpp
@@ -139,6 +139,7 @@ static int RunDecodeToSurfaceFuzzingJXL(nsCOMPtr<nsIInputStream> inputStream) {
 
 int FuzzingInitImage(int* argc, char*** argv) {
   Preferences::SetBool("image.avif.sequence.enabled", true);
+  Preferences::SetBool("image.mem.max_legal_imgframe_size_kb", 65536);
 #ifdef MOZ_JXL
   Preferences::SetBool("image.jxl.enabled", true);
 #endif