diff --git a/version.c b/version.c
index 7a48a5f..9e49559 100644
--- a/version.c
+++ b/version.c
@@ -40,22 +40,22 @@ uint32_t MsiGetFileVersionW(const char16_t *filename,
     unsigned char *map = (unsigned char *)mapv;
 
 #define BYTE(offset) ({                                                 \
-            size_t _offset = (offset);                                  \
-            if (_offset >= fsize) goto cleanup; /* outside file bounds */ \
-            map[_offset];                                               \
+            size_t _boffset = (offset);                                 \
+            if (_boffset >= fsize) goto cleanup; /* outside file bounds */ \
+            map[_boffset];                                              \
         })
 #define WORD16(offset) ({                               \
-            size_t _offset = (offset);                  \
-            uint16_t toret = BYTE(_offset+1);           \
-            toret = (toret << 8) | BYTE(_offset+0);     \
+            size_t _woffset = (offset);                 \
+            uint16_t toret = BYTE(_woffset+1);          \
+            toret = (toret << 8) | BYTE(_woffset+0);    \
             toret;                                      \
         })
 #define WORD32(offset) ({                               \
-            size_t _offset = (offset);                  \
-            uint16_t toret = BYTE(_offset+3);           \
-            toret = (toret << 8) | BYTE(_offset+2);     \
-            toret = (toret << 8) | BYTE(_offset+1);     \
-            toret = (toret << 8) | BYTE(_offset+0);     \
+            size_t _doffset = (offset);                 \
+            uint32_t toret = BYTE(_doffset+3);          \
+            toret = (toret << 8) | BYTE(_doffset+2);    \
+            toret = (toret << 8) | BYTE(_doffset+1);    \
+            toret = (toret << 8) | BYTE(_doffset+0);    \
             toret;                                      \
         })