diff --git a/Core/FileSystems/BlockDevices.cpp b/Core/FileSystems/BlockDevices.cpp
index 50db73c4d2..f6b3d27f1f 100644
--- a/Core/FileSystems/BlockDevices.cpp
+++ b/Core/FileSystems/BlockDevices.cpp
@@ -426,6 +426,8 @@ bool CISOFileBlockDevice::ReadBlocks(u32 minBlock, int count, u8 *outPtr) {
 		block += frameBlocks;
 		outPtr += frameBlocks * GetBlockSize();
 	}
+
+	inflateEnd(&z);
 	return true;
 }