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-rw-r--r--src/StormLib.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/StormLib.h b/src/StormLib.h
index 0e4c411..f7279e6 100644
--- a/src/StormLib.h
+++ b/src/StormLib.h
@@ -255,7 +255,7 @@ extern "C" {
// BlockTableOffset = pHash->dwBlockIndex << 0x04
// Malformed MPQ maps may contain block indexes like 0x40000001 or 0xF0000023
#define BLOCK_INDEX_MASK 0x0FFFFFFF
-#define MPQ_BLOCK_INDEX(pHash) (pHash->dwBlockIndex & BLOCK_INDEX_MASK)
+#define MPQ_BLOCK_INDEX(pHash) ((pHash)->dwBlockIndex & BLOCK_INDEX_MASK)
// Compression types for multiple compressions
#define MPQ_COMPRESSION_HUFFMANN 0x01 // Huffmann compression (used on WAVE files only)