diff --git a/Source/Core/DiscIO/VolumeWad.h b/Source/Core/DiscIO/VolumeWad.h
index 8b0fed6fec..b3837c8431 100644
--- a/Source/Core/DiscIO/VolumeWad.h
+++ b/Source/Core/DiscIO/VolumeWad.h
@@ -18,6 +18,7 @@
 
 namespace DiscIO
 {
+class IBlobReader;
 enum class BlobType;
 enum class Country;
 enum class Language;