diff --git a/pcsx2/CDVD/BlockdumpFileReader.cpp b/pcsx2/CDVD/BlockdumpFileReader.cpp
index a94df9cae7..edbc053368 100644
--- a/pcsx2/CDVD/BlockdumpFileReader.cpp
+++ b/pcsx2/CDVD/BlockdumpFileReader.cpp
@@ -35,10 +35,9 @@ bool BlockdumpFileReader::DetectBlockdump(AsyncFileReader* reader)
 
 	reader->SetBlockSize(1);
 
-	char buf[5] = {0};
-	reader->ReadSync(buf, 0, 4);
-
-	bool isbd = (strncmp(buf, "BDV2", 4) == 0);
+	char buf[4] = {0};
+	bool isbd = (reader->ReadSync(buf, 0, sizeof(buf)) == 4 &&
+				 std::memcmp(buf, "BDV2", sizeof(buf)) == 0);
 
 	if (!isbd)
 		reader->SetBlockSize(oldbs);